So, some background, i am 14m so am obviously very awkward about things like this, but it was made worse who it was
Friend group XYZ is a group of female friends that I get along well with and chat to quite regularly, it is just made awkward by the fact that I had a crush on X in elementary school and a crush on Y a few months ago, they both know, but neither reciprocated the feelings, and now all three of them think Z is next because of the pattern.

BUT ANYWAY into the story, I had been chatting to this group in the lesson and heard a conversation going on between X, Y and a mutual male friend, I didn't hear much, but they asked whether I heard anything and I told them that I didn't hear anything. Their faces were red and they had been laughing so I assumed it was a joke that I hadn't heard.
Later that lesson I was put into group work with the mutual friend and I asked what it was about, he wouldn't say at first, so I asked again, and he told me that both X and Y were on their periods.

So, am I the asshole? I feel like I found out something too sensitive, or am I overreacting, and am I the asshole for going out of my way to find this out? I'm very awkward, which probably made it worse, and I also asked Z what it was about before I asked the friend and she just went red and started laughing, I'm not asking for advice, as this happened a while ago, but its been bugging me, please let me know what you guys think.