What can this be?

My lower back hurts
My boobs stopped aching after a month (right after my 3-day period) - I HAD BROWN BLOOD on the 3rds day.is that normal?
When I had it my cramps were different I feel like my stomach is bigger.
My right leg hurts or cramps a little
I gained weight or my tummy is bigger and hard when touched.
I had 2 other periods before the last one but they were light too.
I didn't have sex, I just dry humped fully clothed. 1 time I was only in pjs but he had pants and boxers on.
blood test came hCg less than 2 after 13-15 days after possible conception. all the hpt preg tests came out negative.it's been 7 - 9 weeks. What could this be?
I feel fluttering in my stomach. It thumps hard! I don't know what it could be. Sometimes it's in the pelvic area, right in the middle of abdomen, or right and left sides of the stomach or near my rib cages. Sometimes I need to let out gas, sometimes, I don't. Please help?What can this be?
You're just having really bad PMS, but it's normal.
how odd...go to the doctor and tell them ALL of this. it may be really important!