So saw a provider a few days ago. Everything was going well and after a great bbbj, I asked about the main course. Was told she was on her cycle, so fs was off..  
the bbbj was great so not too upset but was expecting  fs and she didn't t tell me ahead of time that she was having her time of month.  
Unless she is a bij girl only, why would a pro work doing her cycle or at least tell someone ahead of time.
Any others guys experience ever experience this?

... it was with an FBSM provider I’d seen several times before and it seems to have happened unexpectedly right before I arrived.  It did take one thing off the menu but I still had a good time.
But your situation seems much different. It was a FS provider and I assume she charged you her regular FS-style rate, right?  In that kind of situation, I’d expect that a Professional would give a heads-up as soon as she knew about it and give the option to proceed or postpone the session.  Or she could offer a discount (or a time extension, if feasible) due to FS being off the menu.
IMO the provider could have handled it more professionally, based on what you told us.

The provider always was willing to adjust her rate accordingly or simply reschedule.

Experienced last week with my regular.  We almost decided to go for it cause we’re freaks but the flow was pretty heavy.  I think the schedulers may pressure them to come in on period days because technically they’re just fbsm gals

Always ask before scheduling.  Its your $$.  Super fn annoying geting to an appointment for them to mention it.  
Take the week off, or work at a reduced rate if the goods are of limits

Put down a tarp and go for it.  There is no particular reason to avoid sex during a period.  You can lick clits without getting near the blood, etc.  And during intercourse the blood is just another lubricant.   It is a bit messy, but if you have a towel underneath, that takes care of it.

I like your style!

Yeah, I think I will pass in that. Gross

I dont want to say the young lady's name because I don't think she did this maliciously, but from her reviews, she is a massage girl in which FS is a YMMV type of thing. I guess I was just more upset that I wasn't told ahead of time. The massage and bj were great and she did tell me she would make it up to me next time.  
I will plan on making another date with her in a few weeks and see how it goes. Again she was super nice and apologetic about it, so I'm willing to give it another whirl around in the future.