Confused, Period Issue?

Hi all, well i posted a question on here last week as my period was 6 days late, anyway it came on the 12th and now its the 16th and my period has stopped? this is quite short for me, anyway first day of my period i woke up with very very bad cramping, and the toilet looked like a murder scene, sorry for too much info, then i had back ache all day followed by more cramping, next day pain had gone, just a heavy-ish flow, but then yestday it was light and today nothing. i stopped taking the pill 5 months ago and had a withdrawal bleed and a normal period last month, but that too was very painfull with clots and back ache, but lasted 6 days. this time i had more pain concentrated on my ovaries, right one to be exact, dunno if something is going on in that region, or what, this cant no longer have anything to do with taking the pill. i am trying to concieve and taking 2 cheap test, but both negative. any advice would be great thankss x