Need advice! Please help.

I was fertile the 16-21st of this month. Me and my fiance have been trying for 3 month for a child. !!!

We had sex on the 17th 18th 19th and 21st which was the day of my ovulation. I noticed on the 22nd the day after my ovulation some cramping which I had never had...mhhhm I also had some heavy discharge, and felt tired and a little nauseated to my tummy. I have not had any spotting.:( but my next period is on the 4th. Can someone please tell me their experience with conception of their first child done early symptoms or what this might be. !? Please.