I think my body's playing tricks on me!!

My period cycles are really long and are about 40 days,and my period lasts about 4 days. My last period was on the 24 and I had unprotected sex several times after that, but most importantly on the 14 because I think that was around the time I ovulated. About 2 weeks after the 14 I had spotting, which I thought was unusual, and a few days after that I noticed that the bumps around my nipples were larger and there was a prominent blue line in both of my nipples. I also started feeling sick and I had gas really bad. A few days later my boobs were a little tender but not too badly. I also felt like sleeping for a month! I had been trying to get pregnant for several months, and for some reason I felt this time was different. I took a pregnancy test a day before my expected period and it was negative. The day after my expected, I started. I know now that my body was just playing tricks on me, because of the period. I figured that I had wanted it so bad that I completely made up the signs in my head. But what i'm really worried about is my period isn't quite as heavy as normal, but it seems like after I use the restroom there are several blood clumps or stringy dark red balls of blood(that's the only way I know how to describe it as) either floating or sinking in the toilet. These are normal I get them everytime I have a period, but I usually only have one everytime. This period I have about 6 or 7. Is it possible that I had a miscarriage, or are these a sign of something else, maybe even normal? I don't know and I'm kinda worried, any help would be great!!!