If you are due for your period on the 24th you should be past your fertile period. Go find a site that explains the estrus cycle and the timing of ovulation. Secondly, yes you should have taken the emergency contraceptive after you had sex, if you were so scared about getting pregnant and took it after you had sex the first time, why in the world did you continue to have sex without protection after???? I have been on ortho evra 'the patch' for almost a year, it is great, but hun, you really should have thought about birth control and protection before having sex at all.

In summary, I think you will be fine, unless you are a late ovulator, but please be more careful, get educated about birth control, different types of protection, and study up on your cyle.

Basically you need the date of your last period. (the day that you first noticed blood) and the average length of your periods. From the first sight of blood to the following first sight of blood) you dont need to know your leuteal phase, it will just estimate it. When you get your ovulation day, 2-3 days before ovulation, and about 3-5 days after you ovulate are days when you are fertile.....And should not have unprotected sex unless you want to get pregnant. Just in guessing I believe you had sex after this time and should be o-k....But why have to worry so much....Think about protection and be responsible before you have sex again!!!