I'm TTC my Rainbow baby now and it's been about two months. I took an OPK on August 5 because one app said I ovulated the 4, while the other said the 6th. So we BD throughout my fertile week. Anyhow; when I entered the positive OPK for the 5th glow changed my period date to the 20th instead of the 18? I took two pregnancy tests and they were cheap but negative... I have tender boobs and on and off bad cramps. Could I just not be pregnant?