We went off birth control 3 months ago and my periods have been regularly appearing per this app. We went on vacation this past week and I promised myself I would get back into the gym swing 5 of 7 days which I did. I was supposed to have my period 3 days ago...I've taken 2 tests each has been negative. I read if you're super athlete or underweight your period can stop...I'm neither... but maybe it was the new exercise regimen? I really don't want to take another home test this month...thoughts?