What are these symptoms?

Lori

Hello ladies. I've been trying to google the probable cause of what I am feeling. But i am in my fertile window according to Glow, and i have been feeling very strange. Headaches. Sore breasts. Nauseated and just a weird feeling. Last time I BD was on the last day of my period which was on the 14th. I have never experienced these symptoms during my fertile windows before. I am also cramping. Any help would be appreciated. Thank you.