First urinating immediately (clear the pipes) and alcohol wipe is better than nothing.
Generally speaking you're going to need to wait a week before being tested, if you are to have an issue there is a widow where you "could" (possible) test negative and be positive.
A good site to read up on this is below. Please note, I'm speaking in generalities and I'm not giving medical advise.
Lee Dreams
"Sine amore, nihil est vit
Someone has already given you the testing windows, so you should have that information. Drinking a lot of water, well, let's just say I am not sure that is going to do much for you, and is not in any of the literature I have read that suggests it has any value in post-coital unprotected sex prophylaxis. Same with the alcohol wipes.
The main things you'll need to test for are the usual: gonorrhea, chlamydia, syphilis - i.e., all of the usual culprits in an STD panel. You can do this fairly quickly after the incident, and chances are, the doctor is going to hand you a Z-Pack at the same time as you test. Chances are, as she is tested monthly, you will also turn out to be negative for all of this, but they hand out the antibiotics in this situation as a matter of course.
Now, the big ones: herpes and HIV. I won't comment on herpes, except to say that the usual definitive test is 12 weeks out, at which time the body should have started producing antibodies to that infection. I am unaware of a PCR test that would provide results any quicker, but even if one exists, you'll still need a standard assay at 12 weeks to find out definitively whether you have been exposed or not.
Now onto HIV. The good news is that it is, as a man, not very easy to catch HIV from a woman, especially in a first world, industrialized economy, and the prevalence of circumcision in the US
and other western countries. Most of the transmissions that do occur, contrary to some of the scare campaigns that continue to be conducted, is man to woman (still relatively rare), homosexual encounters, etc. In short, the odds of having caught HIV from this encounter are small to nil, and I doubt any infectious disease specialist would even recommend testing based on this incident alone. However, of course, the only way to be sure is to go ahead and test.
So, we come to the testing windows. Fourth generation tests (those that test for both antibodies and the P24 antigen that appears early in infection - typically before antibodies show up) may be taken two weeks after a suspected exposure. The results of this test are very unlikely to change, and may safely be followed up by a test at 6 weeks - a standard Elisa test (either by blood draw or rapid test). Most people who have been exposed to the HIV virus will seroconvert (average 90%, if I recall correctly) by the six week mark. The combination of these tests will give you a very good idea as to your overall HIV status. The CDC still recommends testing out to 3 months, though some states (such as Mass) recommend only testing out to six weeks. Of course, how and when you test will depend on how anxious you are about the idea - as I said earlier, testing is most likely not even warranted in this situation, but if you'd like to wait the standard 12 weeks, you can do the herpes and HIV tests at the same time, and the results of each will be definitive.
I caveat this by saying that I haven't kept on top of recommended CDC testing windows for HIV, which you almost certainly did not contract, but the last time I did check, they were sticking with the 12 week time period, even though it appears now that six weeks is good enough. Things change slowly, especially testing protocols, even given fourth generation tests.
And that's all I have to say about that. I am not a doctor, so take that into account, I just happen to have done work counseling people in exactly these situations, so I've done a bit of reading on the subject.
Actual condom breaks are now rare unless they are well beyond expiration, or if improper [oil-based] lubricant is used.
In most cases, the condom slips off.
This frequently occurs when wood declines during the act,
The reflex response is to accelerate and deepen the pumping.
In fact, this will facilitate slippage and removal of condom.
Rather, one should pull out, regroup, and clean up before you lose the rubber.
Can always begin again in a few min.
. I came on her stomach (it was too late to stop at that point). She wasn't freaked out, although I was a little. 
