If you had sex on day 7, for argument's sake, and you ovulate on day 14, you can see the chances are pretty slim for conception, so I wouldn't waste any time worrying about it this time around. If you period is late, best thing to do is get a home pregnancy test and use it. Keep in mind, however, that if you decide to continue sexual activity, birth control pills will do nothing to protect you against sexually transmitted diseases.
Sex brings a ton of responsibility with it.
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