Help!? So confused!

Sydney • Mommy of a 2 year old boy and a 6 month old girl ❤
Okay so I've felt like I'm pregnant for a couple weeks but I had my period or what I thought was my period for about 4-5 days. The period was different then usual. It was more red/brown then pure red. I'm still getting headaches, mild cramps, bloating and extremely tired but all my at home test have came out negative. My stomach also feels like it's getting firmer and I have no appetite. Anyone with similar stories or advice?! I feel like I'm going crazy..