Abortion

Me & my ex had sex a couple weeks ago & he didn't pull out, I took plan B a day or 2 later & my period hasn't come yet & I haven't had any symptoms of even starting I'm not sure if I'm stressed or the pill threw me off. But if I do have to start considering my options.. I have never thought of abortion before & now that it's come down to it.. I don't want my ex's baby. He was a rebound to my new ex & im still in love with him although he has a new girlfriend.. I'm still not over him & I need to know if doing the right thing? I'm only 18 & start college in the fall I don't think I'd be able to do it & if I did I would not get back with my ex that is the dad.