My period has been consistent for months now. It has always started on the 16th of every month. But, last month (January) my period was 4 days late, it started on the 20th. Now it is Feb and still no period again. I waited for the 16th and nothing now it is the 21st and nothing still. I am really confused! What could be the reasons?

Cycles will fluctuate for a variety of reasons. Some of which include; pregnancy, illness, weight gain/loss, hormone fluctuations and stress. All women will experience this and periods are rarely as consistent as starting the same day every month for long periods.

This is so crazy! I took a pregnancy test 2 days ago and their was supposed to be 2 lines that show up but in the control window on the test NOTHING even showed up. I don't understand because I'm really happy and satisfied in my life. Really crazy for me. Thank you for responding to my question!

Have you been put on any new/different contraceptives recently?

I'm not on any birth control either. My period really has been on time for months now. That's why I'm confused because it just started happening to me. I don't know best thing is to schedule a dr appt. See where it goes from their.