No Longer on Birth Control

I have been on the pill forever.. Some on, some off... I have gone on it and off it previously with no real side effects when I was early 20s. I am now 28, and recently married, and we decided to go off the pill again and start trying for our first child. When I went off the pill my period came immediately, which makes sense... and it lasted about 4 days... But then it came again two weeks later, lasted about 4-5 days, then came again two weeks later.... Now, according to this app, it should start today, and isn't here... I seem to have some symptoms, but honestly, they could go toward pregnancy or PMS... Breast tenderness, tired, light cramps...Any thoughts on what my body is up to?