If you had your period after you had sex, then it's unlikely that you're pregnant.
But, some women do get bleeding during pregnancy and mistake it for a period. Not trying to scare you, but those are the facts.
If you're worrying that can also delay your period. Stress, weight gain, weight loss, medication, illness, and many other things can delay your period, and PMS and pregnancy symptoms are almost exact.
If you want to put your mind at ease then try a pregnancy test in a week or two. But my guess is that you're not pregnant. That is just a guess though, we can't give you a diagnosis online.
Good luck, and from now on, be safe. Use at least two forms of birth control, and realize that even then, pregnancy is possible.
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