I need answer because this dude playing.

I am 17 weeks and 6days pregnant. Me and this guy messed around in March the last time was March 26. I just got off my period a week before. Plus I was on birth control. I still have periods. Sometimes they’re regular and irregular. Mines always come on at the end of the month but on different days. That was the last time I messed with him. In the mean time me and my baby father was messing around too. He never pulls out! So April comes. My baby daddy is the only person I’m dealing with. We are on good terms. Well was until now. We messed around April 7th and 15th. I had my last full period was April 26th (five days) So May comes me and my baby daddy messed around on May 11th. A day before my ovulation day. Even though I’m in the pull. I always keep track of my health. I missed my pill that day due to me rushing to work. but I took a plan b and I took my birth control the next day. A week later my friend suggest I take a test because I was gaining weight. I’m gaining because I’m taking some apetamin. It helps you with weight gain. And I’m taking multi vitamins because my doctor suggest it due to the affects of birth control, I just started the apetamin that month. So the test is negative. That weekend I started having headaches, bad cramps, and I was nauseous bad. I’m thinking my period is about to come on the next week or after. I’m still cramping bad like real bad. I started eating junk food alot. I knew something was wrong because I ate junk with my first pregnancy. Monday come again and I took another one and It’s positive. I’m due January 28th. My baby daddy thinks he’s not the father all of sudden because his gf had a baby last week. And she found out I was pregnant. She knew about us for years. They been together since November of last year. I told him what happen in March and who I messed with in March. He knew this. Tell me if I’m wrong. If the other guy was the daddy my due date would’ve been this year? Ps my due date is three weeks before my first baby due date. Which was February 10th of 2019 so I’m already aware that my baby daddy is the father. He’s the father of my first bornZ