Advice no judgement 😞

So I’m pregnant after trying for 4 years with my ex fiancé. Basically the second time I had sex with my new boyfriend I got pregnant even though we used a condom. Only a few weeks into our relationship we were only officially dating 2 weeks. I’m 25 and it was very hard trying to get pregnant previously which is why this is so shocking and exciting well he apparently has a baby due next month. He told me a girl told him she was pregnant 2 weeks ago but clearly she was before me and I shouldn’t worry because he doesn’t believe it’s his he said she told him it’s out of him and her baby daddy she already has a child with so today he tells me he think it’s his after we’ve already decided to keep our baby I’m so heart broken and hurt I don’t deserve my first pregnancy to be like this what’s going to happen when we both need him being that I’m due in September this pregnancy has been terrible being that I had a hematoma and cyst , I have extreme HG , and hyperthyroidism and this just put me into depression. Do I move on and raise my baby in a co parent situation or try to work it out ? What did I do to deserve this