First off, you're basing your argument on the assumption that life begins at conception. The dispute lies there, not in anything later in what you argue, so it might be a good idea to back up your argument at the point of contention, which instead you put forward as an axiomatic assertion.
Also, a number of your statements are obvious propaganda for the anti-abortion crowd and easily proven false, though I am not even going to bother.
That I, someone who doesn't care about abortion either way, could find such flaws in your argument so easily, means that you need to refine it rather than presenting it as the dogmatic fact.
Key words.
Let's not forget the number of pregnancies that end without the mother knowing she's pregnant.
This issue is nothing but hot air and sentiment. Abortion is not nice, and shouldn't be encouraged as a first option, but the option should always be there. Abortion is one of those issues, like gay marriage that conservatives use to get the vote out. But when it comes... they do nothing why? Because they really don't care and they're using them.
Abortion will NEVER be made illegal while the majority of americans - and especially women remain pro-choice, thankfully.