My wife had her periods on 1,2&3 May 2016. Then we had sex on 15th & 16th May. Though we didn't use a condom but neither i cum inside her. To be on safe side she had i-pill(She never had it before) on 17th May, almost after 60 hours of first sex. On 25th May she had bleeding for 3 days. Now we are confused. Is it periods or withdrawal bleeding? If it isn't periods then on which date should the next one come? Normally she gets her periods in 33-35 days. And also is there any chance of pregnancy? Suggest us what to do. Thanks!