If a woman chooses to have sex, it's her responsibility to provide birth control. If you want to prevent abortions, have those getting pregnant accept the results of what they chose to do instead of taking the easy way out by killing it.
Your argument:
I oppose abortion, but I also oppose free contraception and sex education which reduces abortions. So I am just perpetuating a problem in order to complain about it. I oppose casual sex simply because I cannot get it, even though I think I'm entitled to it.
You're no better than a monkey touching itself in the corner of its cage at the zoo.