Slept w/ guy a oct29 guyb arnd nov 11 dec18 went to er for gushing blood preg test neg on march 10 measured me 19w5d last period oct 24 who is the dad?

Probably the 1st guy: But there are paternity tests that can be more confident. I hope you can be more in charge of your life as the next few months pass. You'll need to be in order to handle life w/ a baby. Consider finding a good supportive counselor/therapist who can guide you w/out personal issues getting in the way. Good luck!

Genetic testing: It could be either one. Ovulation is not always exact. You will need genetic testing to know who the father is. Good luck.

Here's the problem: Ultrasound at nearly 20 weeks can be off by almost 2 weeks, but since you know your last menstrual period it is most likely guy B around 11/11. Having said that, many states require paternity testing in order to allow a potential father to sign a birth certificate as they are financially responsible for child support. Be smart and do the testing on guy b first.