Id be a lot more concerned about the context of why, before anything even happens. “Oh btw I might cry because trauma” is putting a pause on whatever’s happening and starting a longer conversation about boundaries, discussing how I can tell her actual feelings the whole time. I’m triple checking that she’ll stop if she’s not happy.
If my girl was trying her best to please me and it was something she wanted to do but had a bad history, I’d be trying my best to make it as pleasing to her as possible, do what she wants, and give her the best experience I can. If she has sexual trauma and was freaking over us having sex because she downright hates it, then I don’t think it would be a relationship I could stay in, I am an active sexual person and I have my needs. I can’t do outright asexual atm.