I had unprotected sex on September 17th. I started my period on October 1st but my period was only 3-4 days. Could I become pregnant from that one day on the 17th?
The 17th was around two weeks before your period so that is the time you would be ovulating and have a good chance of getting pregnant. Having unprotected sex when your body is ovulating makes it very hard to avoid getting pregnant. But if you had your period then hopefully that might mean you are not pregnant, although some pregnant women still get a light period like that, even though they are pregnant.
The only way to know one way or the other is to try a pregnancy test.
