My cycles are usually always 28 days. I had a stillborn back in March, but my periods became regular, until now. The last time I had sex was around July 12th (pull out). I got my “period” the 31st of July, it lasted barely 4 days and was super light with no cramps. I have just gone through a big move and moved to high altitude, and had been driving back and forth a lot. I was supposed to get my period August 27th and STILL nothing. No symptoms, nothing. I’ve taken 3 pregnancy tests, all negative. What is going on?! I’m worried