Ok ladies I need your advice, pregnant or not?!

Okay so I’ve been on my birth control for a month and a half, last month I seriously just felt like I conceived. my period rolled around last Thursday and I ended it Sunday completely.. Monday I got really Nauseous at work and had to come home. And I started spotting. Tuesday same thing, got sick at the same times, 9:00/9:30 am. But I didn’t come home. So Monday I took a pregnancy test and it was negative. Wednesday I felt okay the sides of my stomach hurt, and I’ve been cramping a bit. I’m so fucking tired. I stopped spotting Tuesday after there was some brown stuff and today I’m yet again warm and not feeling well... I just don’t get it. My test was negative. I seriously don’t know if I’m coming down with something or I’m pregnant. I’m going to test tomorrow. I don’t know if it’s something I want so bad that my body is just “acting pregnant” has anybody had this before?

My grandma also said she had 3 cycles while she was pregnant with my uncle. So I think that’s tripping me out a bit!