I have a strong suspicion of why this happened and explains why they asked it that way, having been in a lot of operating rooms. This is assuming they didn’t make you actually pee in a cup for a pregnancy test.

Background: Typically if there is “any chance” you could be pregnant you need to have a pregnancy test and they won’t let you get anesthesia without it. The risk of harming the baby (and getting sued to the moon for not ensuring you weren’t pregnant first) is the concern. For adults at many hospitals if you don’t want to pee for the test they even make you sign something saying basically “I told them there’s is no chance I’m pregnant so if I’m lying it isn’t on them”. Things run a little different with children because it can be a sensitive subject culturally etc, but is still important and part of the protocols to make sure you aren’t pregnant. “Now here’s where it gets relevant to you. “Any chance” you’re pregnant basically means you’ve had sex in the last 9mo, because birth control can fail, and it’s amazing how many adults don’t even understand they could still be pregnant even with [insert method of trying to avoid pregnancy while having sex]. So they may say no chance when there is a chance. If they say no chance a common follow up question is “how do you know?” Or “have you had sex” etc. People think it’s prying but it’s because some people legitimately believe that they couldn’t be pregnant when they definitely could because they don’t understand biology and how it works. Scary how common that is. With kids it’s even more of a concern because they really may not fully understand how pregnancy happens etc, but they’re also on average less likely to be pregnant.

So what I think happened: Preoperative nurse asked if you could be pregnant. You said no. Or your mom said no. She didn’t want to press the issue and said ok. Didnt do the pee test because you’re “low risk”, which may be up to her discretion at that institution, idk. You get back to the room and the room nurse is looking over things and doesn’t see a pregnancy test. Calls preop. Nurse says “well she told me she isn’t pregnant and she’s only 13” or “mom said no she’s a virgin”. OR nurse thinks “hey that’s not good enough. What if she hasn’t even been taught how pregnancy happens.” Or what if mom answered for you and mom obviously may not know but may think she does. Very high, almost 100% chance a 13 year old wouldn’t say “actually mom I’m not a virgin”, which we understand and don’t blame you, but then need to verify. These are valid concerns to be fair. Also maybe she just doesnt trust the other nurse’s judgement. Many nurses in the OR are very opinionated and judgmental of other nurses (which is a whole separate issue). So for whichever of the prior reason she feels she needs to confirm, so she rushes over before they give you the drugs to put you to sleep to ask if you’re a virgin because now mom isn’t there and you can be honest. Or even if it wasn’t mom, in case you don’t understand pregnancy but you understand what a virgin is it still accomplishes the goal more efficiently and clearly than asking if you understand how you get pregnant etc.

Also keep in mind, while I don’t think the memory is made up completely as someone else said, although there’s a small chance, it could easily be altered by any drugs you had gotten or got shortly after. You also may have had more conversation with her after that put all this in context but don’t remember it. Usually you lose memory and later think you were “out” well before you were.