Girlfriend's past makes me angry?

I'll try to keep this short and to the point. I've been dating this girl for about 6 months. I'm a virgin (23) and she is not (21). We're waiting until marriage for religious reasons. Throughout the six months of us dating she's made some mentions to her past relationships and sometimes mentioned some of the sexual aspects of it. She recently brought up something that had she brought up in the beginning of our talking.. that she wanted to have a baby with her ex and that she was struggling to get pregnant with him. She brought it up again yesterday and it makes me so angry. I hate the idea of another guy sleeping with her especially doing "that".

It makes me so unhappy. Should I bring this up to her? I would love some advice. I feel like things would have been so much different had I had some sexual experience. I feel like we'd be on more of an even playing field. I would love some advice.

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It makes me feel like I lost to him.. I truly feel like I've found an amazing life partner and ofc there's something like this.. it makes you question why even exist.
Girlfriend's past makes me angry?
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