had sex during my periods...?

Hi,
Welcome to ehealthforum,
If the intercourse that you had was during the time of ending the periods, then chances of pregnancy cannot be ruled out completely (especially if you have had an early ovulation). You get closer to your fertile days/ovulation time as you finish with your periods. The egg once released from ovary can stay alive for 6-7 days and sperms once released can stay alive for 3-4 days inside you. The bleeding that you are having at present could be suggestive of possibility of implantation bleeding. Look out for development of any other new symptoms suggestive of early pregnancy if you suspect chances of pregnancy. Wait and watch for your periods/withdrawal bleeding. Visit your doctor/gynecologist for further evaluation and assistance.
Take care.