Fuck buddy says she can't have sex for a week - by: Pullup_Strength

I made plans to meet up with a girl I met off tinder for the third time yesterday after having sex with her on the first two dates that were both last week. Two days before the scheduled date she texted me saying she wanted to give me a heads up because she thinks she won't be able to make it out on Thursday because of having to stay longer at work and said she might have to reschedule. I said ok and said hopefully it goes well. Thursday comes around and she texted me saying she can't make it out. I said ok no problem.

Later Thursday night she texted saying she was so sorry that she couldn't make it out. I said it was ok and it wasn't her fault and that we could reschedule. She responded saying she knows that but just felt bad and said she would like to reschedule. I then asked her how her schedule is after Saturday.

She didn't respond until this morning (Friday) saying that she's free Sunday and isn't sure about during the week because of a new system being implemented at work which would make it a disaster. She also said "I feel like I should mention I can't have sex for about a week".

Is this some sort of test to see if I'm only in this for sex lol? I only want sex from her and don't want to meet up without banging her on Sunday. So how should I proceed? Has any of your fuck buddies ever do something like this with you where they said they can't have sex with you when you meet next? I'm new to this fuck buddy stuff and noticed it wasn't covered in Chris' retention guide.

I'm thinking to say something along the lines of "Sunday won't work but maybe we could see how things work out during the week" and then just wait until next weekend to contact her again to try to schedule something for the following week This or possibly asking about why she can't have sex?

Edit: Just realized that she could legitimately be on her period. Still need some advice on how to proceed (i.e. don't know what we'll do if we aren't meeting for sex)