When you felt the soreness that could have just been the fertile time. But oh wow that woke me up today!
I by no means am trying to place judgement but to inform you:
I do not know when you can test for these things but it would be in your best interest to inform both male parties and in case something happens you can at least be able to get parental involvement and / or child support down the road. Don't be surprised if the current boyfriend takes a walk especially after hearing it could be another man's child. Or vise versa. But by law in all 50 states, whom ever the father may be, he is responsible for aiding in raising that child. I wish you the best, its going to be a long road.
"The true joy of life is the trip. The station is only a dream. It constantly out distances us."