Is it wrong of me for being happy??

My boyfriend and I started seeing each other back in May 2016. We started dating September 2016.

So it's a really new relationship but I'm so happy with him and all that!

Well I just found out that I'm pregnant and he's really happy and so am I. We told family and friends and word got around to his ex that we were expecting.

She flipped shit on him because they were together 3 years and she wanted a baby but they never had one. She blamed him for not trying hard enough and pretending to love her and leading her on and stuff. She is a little crazy. She cheated on him so many times and he kept forgiving her until one day he just couldn't do it anymore and they broke up. She's mad that I'm pregnant and is saying how I don't deserve to be a mom even though she really doesn't know who I am but I'm the bad guy. She even had the nerve to say that I should abort it because hell just come back to her