Been feeling off since the 24th of july

I took a test about a week ago and it came up negative. I have been feeling off. Headaches, on and off cramps, hungry more, using the bathroom more, in the beginning I had a fever (that's gone), stomach aches, I look bloated, I'm more tired, I spotted a little on the 8th or 9th. I have noticed that my pants are now leaving marks like they are to small.i have gained weight like 3 or 4 pounds. I have no idea what to do. Can someone please help me?