I had protected sex on may 11, the week of my ovulation cycle. my period was supposed to come may 26 and its still not here, today is may 31. please ?

Can do preg. test: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is the common cause of a missed period, if sexually active.