Is this my period or something else?

I had a period on may 31st which lasted 7 days. I ovulated on June 13th. My husband and I had sex the 11th through the 15th. On the 22nd or 23rd, I started having having headaches, getting nauseated, having cramps, and having weird feelings in my abdomen. On the 26th, I started what I thought was my period. It was really heavy and lasted til the 28th and today there is hardly anything just some light pink. Do you think this was my period?? I also took a hpt on the 25th and it was neg.