PULLING SENSATION, FROM MY BELLY BUTTON TO MY GROIN. IT FELT LIKE A "STRING" WAS BEING PULLED

Hello ladies, I'm confused as to what is going on with me. WARNING, my story is rather long. Ok, My last REGULAR period started feb 18,2013(cycles are irregular, but consistant in duration). My periods always last 7 days. On the 7th day my boyfriend and i had unprotected sex 3 times. He did ejaculate in me all 3 times.The next day i experienced a very large amount of clear egg-white like minus. 4 days after that, as i was lying in bed i experienced something VERY strange.(PULLING SENSATION, FROM MY BELLY BUTTON TO MY GROIN. IT FELT LIKE A "STRING" WAS BEING PULLED) 5 days after that i felt dull cramps lasting about a minute, discharge lasting for days. (Clearish-yellowish). Pain in thighs,nausea in the middle of the night,fatigue,dull cramps in lower back, very thirsty and hungry.These symptoms are on going. FAST FORWARDING, So on March 21st, i got what i THINK is my period as it started out very light, like water. Few hours later it was reddish-brownish with mucus. Next day the flow picked up,but was still like water with very small clots. I usually have HUGE clots. Oh and NO cramps at all. Day 2,3&4 was this way. Then it disappeared for about 8 hours,as i assumed it was gone. Well it came back again day 5 like water with red coloring. My periods have always lasted 7 days, it has never started out light, nor has it ever ended in 4 days and come back. AND my books have been sore for about two weeks, The only time i've ever experienced sore boobs, was AFTER i gave birth to my first child. MATURE COMMENTS, ADVICE AND SUGGESTIONS ONLY PLEASE. THANKS FOR YOUR TIME LADIES!!!