hi..
it all depends when u had sex.. was it on the last day? did the guy actually come in u? personally, i had quite the same problem. i did it on the last day of my period.. and was freaking out for 1 month... but it finally turn out that im not pregnant. but my bf did not actually come in me. but the precum apparently can contain sperms.. i would advise you to not stress out.. coz it might retard ur period too.
Information on this site is provided for informational purposes only.
It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.