Should I congratulate my ex wife on her pregnancy?

Anonymous
We were together 8 years. She left, giving a vague reason that she was getting unhappy. We kinda talked some after the divorce. She started sleeping around a lot (she admitted it to me, not hear say). We stopped talking eventually, and now its been about 6 months since I've heard a thing from or about her. The other day I heard from a mutual friend that she is pregnant. She apparently continued sleeping around, and got pregnant. I was thinking of sending her a text. But I don't know how to word it since it doesn't seem like an ideal situation. It sounds as if she didn't really know the guy, and I have no clue if he stuck around or not. Didn't really get details. This is what I'd say if it was planned, but I feel like it would be inappropriate given the apparent circumstances:

"I heard the big news, congratulations! I bet you and your significant other are excited. There's no need to reply. I'm not trying to conversate or anything. I just wanted to say that I'm really happy for you"

I'm just not really sure this is a happy/congrats type of moment. I don't know what I'd say though. I don't want to resume talking to her or anything. I just thought i'd say something nice, and I am/would be genuinely happy for her if this is/was a positive situation. I feel bad though if it isn't.
Should I congratulate my ex wife on her pregnancy?
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