My LTR recently got a UTI, I suspect it’s from a time last week when we had sex on her period with a cheap condom I had laying around, it was heavily coated with cheap lube. But I don’t know the real source. She took antibiotics after going to the doctor and it went away

We have had sex exclusively without condoms for the last year or so, she is on the pill but I pull out every time as it makes both of us feel safer. Today, she says to me that we should start using condoms again, every time. When I questioned her on it, she said that it’s safer.

What do?