Desperately need opinions on this, please help?

[RosieXxBoo]

Hello. My name is Rosie. I found out I was pregnant on July 4th of this year. My last full menstrual period was April 18th. However on May 14th, when I was supposed to start my menstrual cycle, I felt a few cramps and wore a tampon. Six hours later I removed the tampon only to see it was only less than half way covered in dried blood. The next day, the same thing happened. On the third day it was completely clear and clean. Only my normal amount of clear discharge. Absolutely none of the blood was ever external, and it was all dark, brown, and dried. My ex boyfriend and I always used protection when we were intimate, however about a week or two before May 10th, ironically Mother's Day, the condom popped. We didn't think much of it. On mother's day, we broke up and he left. Five days later, I was with another guy and we did not use protection. I have talked to my doctors about this and they have informed me that the two dried blood days they counted as a full period and set how far along I was regarding the two days. I am really confused on if the baby could belong to the first guy, or the second guy. I really need a second opinion on this please.

[AnnieBrooke]

Why did neither doctor look at the embryo's measurements by ultrasound?  Just hearing the story and calling it a period is not very helpful.  Have you had any ultrasounds in this pregnancy?