Am I being a bitch?

D

So my partner has an old work colleague - she's strange at the best of times but she's nice.

Anyways she recently had a baby (with clearly a married man who still lives with his wife and kids) he has nothing to do with her or the baby and she didn't even want kids but she had a little boy about 6 weeks ago.

Well me and my partner have said about meeting the baby and Friday we arranged to go to dinner. Fine. She's then asked if she can invite her other friend.. another old work colleague who I haven't met before.

All I want is a baby, I've had a MC at 8 weeks and 2 chemicals within a year. I'm also on my period right now and I can't help but feel I don't want to be around her or the baby or this other friend of hers. I don't feel like socialising or anything.

Am I overreacting? We still have to go and my partner was pissed she asking for someone else to join us too. I hate feeling like this and I find it hard to cover up my true feelings and "act" happy and nice.

Is it ok to feel this way?