Did my ex-GF marry another man while pregnant for me?

From a male CFB reader

My girlfriend and I broke up just four months ago in April and I found out she got married this past weekend.

At the time we were dating, she kept asking me to marry her. In fact that was the reason she broke up with me when I told her I wasn't ready to settle down. We are both 28.

I was surprised at how fast she had found someone else when I heard she was getting married in Asaba on Saturday only for me to see the wedding photos and see she's heavily pregnant. She's at least seven months pregnant. This lady and I were lovers up until she ended our relationship in April. And I remember she was very anxious to tie the knot back then but she never mentioned she was pregnant. Could the child she's carrying be mine? I don't know why I have this feeling it could be. Should I ask her? And if the child is not mine, it means she was pregnant for this man back in April when she was begging me to marry her? But I believe more that she's about to give my baby to another man. What should I do?