I am reading Taking Charge of Your Fertility and I have a couple questions. I've been taking the pill for almost a year now. That is the only form of birth control we use. As far as I know I haven't been pregnant but now I am really curious about something. I thought that the pill worked by preventing ovulation which I thought meant that you wouldn't have changes in cervical fluid. I have definitely had "fertile" cervical fluid in the last year according to the books description. Is that how the pill works or does it actually just prevent fertilized eggs from implanting? I am also curious if semen will change the consistency of cervical fluid during your cycle? I would think that it would make it more watery. Is that true or does it leak out quick enough that it doesn't affect it? Another questions has to do with effectiveness. All I can find is the effectiveness of single methods of birth control. I know that on their own condoms and withdrawal aren't as effective as the pill or IUD's but what about together? Are there any places that have the effectiveness of two or more methods? I would assume that condoms and withdrawal would be very effective. Is that a wrong assumption? Thanks so much!