Please help!

Hey guys, I just literally took a pregnancy test and it's positive. I am petrified right now. I will give you the shortest backstory I can.

My husband and I got divorced about a year ago, we have been catching up for the last 6 months probably one a month, not often. We are not officially together. I have been hanging out with my male best friend who have known for 10 years, I know this makes me sound terrible but I slept with them both a few days apart. I don't know who the father is. I don't know what to do. I'm close with both of them.

Please give me some advice on what to do. My best friend has feelings for me. And so does my ex husband.

Edit - I understand the obvious thing to do would be tell them both the truth, but that is easier said than done. I know I will eventually have to tell them both, but I know it would hurt them both, even tho I'm not actually with either of them. The thought of hurting them crushes me, but I put myself in this position so I will have to face the consequences.