my last period was feb 28...according to my menstrual app i should have my period between march29-april11 but i did not...i had been in a lot of stress during that week so i assumed that could be the reason of the delay. Then i had sex on april 13th and april 15th. I already had a delayed menstruation before having sex, what's the likelihood that i can get pregnant?? i've been using the menstrual app for 3 years and my menstrual cycle pattern is regular in 36-40 days cycle.