Big Secret

Saw a post below this about a woman who didn't tell her husband about something bad that happened to her. Well I am kind of in the same boat.
I am only 26, married four years and I am now pregnant. My husband is thrilled about the pregnancy. Problem is there is a good chance the baby is not his. And an even bigger problem, the baby might be black.
I don't have much experience with men. I had only had sex with two men until recently. Or office brought in a temp to temporarily fill in for a guy who had a surgery. He is black and I will refer to him as "Tim". A couple of weeks into his arrival the girls in the office started to gossip. Apparently, Tim had managed to bed a couple of the girls and they were not shy about describing his manhood. And the work "huge" was used. As I said I had only been with two men ever, and both of them had a small penis. I started to fantasize about what it would be like to be with a well endowed man.
One day Tim started flirting with me and I started melting. I agreed to go out to lunch with him and during the meal he came on to me big time. I said no and he was ok with it but he gave me his call number and said I could stop by his apartment anytime. I couldn't stop thinking about it.
A couple of days later I texted him and said yes. I made an excuse with my husband to be late and I followed Tim home after work. I figured it was safe, Tim was a player and not looking for a relationship. One time thing.
It went great at first. Yes I was amazed at the size of his penis, the girls were not lying. It was more than twice the size of my husband. I told Tim a condom was necessary. I was not on birth control. I wasn't trying to get pregnant but we (myself and husband) had an agreement that if it happened we would be ok with it. I remember trying to roll a condom on Tim's cock. It looked like a little hat instead of a condom. We both laughed. When he finally worked all of it inside me I had never felt so full and stretched. Tim fucked me in several positions for at least 30 minutes. At the end he bent me over the side of the bed and just hammered me. Then panic set in. Tim grabbed my hips and shoved it all inside me. I felt the cum hitting my insides. He just leaned over and held me there until he completely finished. When he let me up I was crying and could feel the cum running out of me. Then I saw it. The condom was laying on the floor! Tim had taken it off when he was behind me.
Tim just told me to get over it and go home. Now I am pregnant and don't know what to do.