Oh dear, you are in a dilemma aren't you?
Well, first of all you need to define 'fooling around' with your ex, and what is 'didn't really have sex'? His penis was near your vagina, and he got horny? That is not really having sex, but it can lead to pregnancy. (Believe me, when I was 23 I told my then B/F keep away, as I knew I was ovulating, but 6 weeks later, ta-da, pregnant!)
Is it wishful thinking it is your ex's?
The only true way you will know is to get a DNA test done once the baby is born, then you can ask the father to pay child support or marry you.
I say this to anyone reading this post, this is why it is so important to chart your periods and anything that happens. (not just for pregnancy but for many other illnesses a woman can get)
By the way your profile shows you as male!
I wish you much luck.
y dont u just get a blood test from both of them. one way or another some truth is going to have to come out for the sake of this baby and for the sake of your piece of mind when u finally get it off ur shoulders
If i were you I would ask the doctor to give you the closest date of conception that they can give you. Then go from there.