Approach to addressing risky past behaviours

I've been seeing a girl for about 2 months and we've established that we would like to take things seriously. She's recently opened up to me about her previous sexual history including having unprotected one night stands and with multiple guys within the last 6 months before me (and not being on hormonal contraception) which is surprising given she's a health professional. I didn't make it a deal at the time, but after heading home I've been ruminating. There are other aspects that leads me to think that she has some impulsive behaviours.

I did mention my surprise at the time which she has said 'it was just on the spur of the moment'. Ideally, I would feel much more comforted if she had the insight to recognise that it was a risky behaviour.

Other reasons I am willing to accept is maybe she was pressured during those situations, or maybe she didn't quite understand the risk (despite being a health professional). Regardless, I'd like to bring it up and discuss it without making her feel judged given it's something very personal, and would appreciate the community's opinion on how to raise this aspect up! TIA