I am sexually active and have missed my period this month. however i have taken 4 pregnancy tests that all are negative. what could be the issue?

Although pregnancy is a common reason to miss a period, it sometimes happens in normal women. A period can be triggered by taking oral hormone tablets you get fro your doc. Most would not go that route unless this went on 60-90 days and pregnancy test remained negative.

Stress from any source (emotional, school, work) can cause lack of ovulation, which will delay onset of your next menstruation. To be certain, obtain a serum HCG test , which can detect even low amounts of pregnancy hormone.