hey all my gf and i have been wondering about the pill, and she decided to take it, she has been on it for about three weeks and in that time we have had sex several times. the problem is that it is time for her period but it has not come yet ??? she is on the third white pill of the pack. we are starting to become worried even thou we also used condoms everytime we had sex, and she has been taking it as directed. has anyone else experienced anything like this? all comments will be appreciated, thanks in advance.