Ive had two periods in one month and they were about 12 days apartbefore the second one i had unprotected sex and about two days after the sex i got my second period for that month..so is that a good indication that im not pregnant?

Any time you have unprotected intercourse, pregnancy is possible. If your period is completely normal, that is a good indication you are not pregnant. However, spotting during pregnancy is possible and that can be mistaken for a period. So, you should take a home pregnancy test to be certain. If there is any doubt, call your doctor for a blood test. Best of luck to you!