Question

Ok so I wasn't having a period , i didn't have one for about 6 so I went to the doctor and he prescribed me some pills because he said I wasn't ovulating soo I took the pills for 10 days and on that tenth day my period came on but I had sex the day before and the day of my period , I didn't know it was coming on that day and my husband didn't pull out is it anyway I could be pregnant , aren't you fertile the day before your period ?