I have looked after a number of women recently who were requesting a termination of pregnancy. The circumstances which lead them to that decision is far from being as clear cut as some people seem to be suggesting. Granted, there may be the few that use terminations as a form of contraception, but the number of people who do is a lot lower than you may think.
It's not that easy to get a termination as there is a fair amount of bureaucracy and red tape to get through, and both the doctors and the nurses will make sure that the woman is sure she wants to go through with the procedure, it's really not a decision that people take lightly, and it has to take into account a number of wider issues including any social, economical, psychological and emotional factors. It's nowhere near as black and white as 'abortion is murder'.
Also, having seen the products of conception following a medical termination, in my opinion (and I emphasise the point that this is my own opinion here), a seven week foetus (for example) does not constitute a human life, because it is not developed enough.
You may argue that a 7 week old foetus has the potential to become a life, and I quite agree, but there is also a 20% chance that it won't, given that around one in five pregnancies miscarry on their own, without any intervention.
To say that one is in favour of termination is somewhat harsh, however I believe that every woman has a right to decide what she does with her body. I also feel that 'life' is far more than just existing in the physiological sense, a foetus exists - entirely dependent on the mother, but when it is developed enough to survive outside the womb, then it can be classed as a life.
As I've said, though, this is entirely my own opinion. I don't necessarily expect anyone to agree with me.