Had sex on projected ovulation date, but for the last 2 days or so my boobs have been hurting like…

Had sex on projected ovulation date, but for the last 2 days or so my boobs have been hurting like im going to start my period. Im constantly tired, headache. I had a 2-3 day period from 02/27-03/01 started around 9pm on the 27th ended sometime near midnight on the 1st. Only reason I know that is I was on vacation and was up planning activities lol. Had sex on Valentine's day last month on my projected ovulation date. What is going on? My gums started bleeding the other day and my husband said that; that's a sign of pregnancy.