Struggling With Pregnancy

It has been hard. Let's start with me and my ex were ttc fir 2 years. It didn't work. Eventually we parted ways. Fast forward 2 weeks without sex and I found my current boyfriend. We had sex and whatnot and 2 months later found out I was pregnant. They put conception date around 4 weeks after I left my ex. So now everyone is doubting that this baby is my current boyfriends. I am 100% positive it is his. Everyone wants me to get a paternity test. Even my boyfriend does. So that is weighing heavily on me. It's just making me hate being pregnant. All the math and everything else calculating my pregnancy points to my current boyfriend. Yes, we will be getting a paternity test done but I hate that no one believes me.