I missed my period for almost 1 & 1/2 months now. Possible cause aside from !

I missed my period for almost 1 & 1/2 months now. Possible cause aside from pregnancy.?

I already did 2 pregnancy test using a "one step urine pregnancy test" at home with 2 weeks interval, both showed negative (one line). Before i run to my OB-Gyn, there may be some one out there who can help me with possible reasons for my delay. Btw, I am married and has 2 kids already.

understanding the eb & flow of your cycles is important, your cycles are regulated by hormones and hormones are regulated by glands, like the thyroid, the hyperthalumas, the pituatary and the ovaries, each of these are affected by different things like the hyperthalumas can be affected by emotions such as stress, your diet can also cause an imbalance, sickness or disease, over physical training can cause delays or even the loss of period altogether, eat a well balanced diet, take 30 minute walks at least 4 times a week and be patient, you don't mention your age as peri-menopause could be an indication, try not to worry just yet if mother nature doesn't kick in after 3 missed cycles some recommend 6 months then see your gyno or if you have other symptoms foul discharge or unusual pain ect then see your gyno right away! best wishes!