My Last "normal" Period Was On 5-5-15. I Had Sex

My last "normal" period was on 5-5-15. I had sex mid May. The end of may-beginning of June started feeling tired, slightly sick, emotional, dehydrated and some cravings. June 1st or 2nd have bad pains, 4th I bleed lightly when I wipe just a few times(brown) that day. The next day every time I wipe and now brighter red. Following day flood gates open, then the next day extremely light and gone. Start July 3rd, same thing and again on the 31st. I haven't gained any weight but my stomach is getting a little rounder and feels "fuller". I tested twice in June and again yesterday, both say negative. My mom had her "period" with me till she was 6 months along, so my question is does this sound like I may be pregnant? or something else going on?