What do you think makes a person a person? Technically, genetic code, sure, but sperm has (part of my) genetic code and I will gleefully abort that on a semi-regular basis, and I suspect most people are with me on that. Everywhere I go, I leave behind my genetic information, without it being a person. Life is a complex matter, and it obviously begins somewhere between conception and birth, given that babies are alive when they come out, and neither sperm nor ovum are alive. I have chosen to put it at the development of a partly sophisticated nervous system, because that is the part of humanity I care most about anyway.
Promoting abstinence not only won't work, it has already failed to work. It was already a stupid idea. "Hey kids, don't have sex." "Yes, we will totally not have sex, even if we get drunk and horny." People tend to make poor decisions at that age, and some of those decisions lead to worse decisions.
Maybe you should get around to telling the politicians that you support birth control though. Since they don't seem to get the idea very well. More or less every pro-life activist I've seen has been staunchly opposed to the idea of women regulating their reproductive health.