Wrong, wrong, and wrong.
Legally the issue is tricky at best. Even in the U.S. there are laws on the books that make pre-marital sex illegal. The Virginia law against fornication was struck down as recently as 2005 (
http://en.wikipedia.org/wiki/Martin_v._Ziherl ) Fornication is defined as consentual sex between unmarried adults. Abortion is being challenged in the law on a more and more regular basis.
To what religion are you referring when you are saying that both are wrong? There are religions in which pre-marital sex is perfectly acceptable. Same for abortion.
And let's look at the ethics of it. Which are you saying is wrong? Abortion or pre-marital sex? Which ethical system are you looking at? Is your ethical system deontological or consequentalist? If it's deontological, which system? Christian? That's religious. How about logical? Perhaps you're consequentalist? Again, which system? Purely utilitarian? What consequences are you looking at? The consequences to the mother? Her family? The child? Society in general?
Arguments could be made from deontological and consequentalist points of view that both pre-marital sex, and abortion are not only ethically allowable, but ethically preferrable in certain cases. Arguments can also be made against both.
You're sweeping statement about legality, ethics, and religious morality just don't work here.