Hello, I'm A 21 Year Old Female And I Am

Hello, I'm a 21 year old female and i am 17 weeks pregnant, this is embarrassing because a tad bit promiscuous during the time i got pregnant. Now I'd like some help in finding out who my child's father is most likely to be. My last period was May 18, 2015 i had sex with someone a while after but we used protection. I had sex with my boyfriend on the 1st and 3rd of June and he came inside me both times. I had sex a few days later with someone else and we used a condom for most of the time and then he took it off. We had sex without for a while and then he pulled out and ejaculated in his hand. I'm a bit embarrassed to talk to my ob about this because i know her very well. Is there any way someone on here can help me estimate who the father is. Thank you for your help in advance.