Who's the father? Help !!!!

So I just found out I'm pregnant. I have included a picture of my cycle this month. Btw I have a 32 day cycle. So I had sex with my ex from March 12th to March 19th (he came home for spring break). Then I had sex with this other guy from March 28th-until recently. My ex came in me but the other guy didn't. I had unprotected sex with both of them. I have been having unprotected sex with my ex for a long time now and I've never been pregnant by him before. I'm just confused on who could be the possible father. I feel like such a hoe and I know I should have been using protection but it's too late for that now. Can you ladies give me your input on who could possibly be the father please and thank you !!!!!! 

Update: I had my 12 week ultrasound. According to my doctors office calculations, the baby show have been measuring at 12 weeks 2 days, and according to Glow calculations 11 weeks, 5 days but the baby actually measured at 12 weeks 6 days. So I'm pretty convinced the baby is my ex. Glow calculated my due date as 12/15, doctor office as 12/10, and actual baby measurement as 12/7. It has to be my ex !