Spotting

I was Spotting brown on January 31st just a little bit it was this much and this is all I had and still no period for February and my next period is supposedly supposed to come at the beginning of March still no period or symptoms of it coming took a pregnancy test February 20th and it was negative anyone no what the spotting could have meant I'm also irregular btw so I wouldn't know when to test🤦🏾‍♀️ I'm definitely not stressed i gained 6-7 pounds in 1 damn week🤦🏾‍♀️ I'm having an odd stretching feeling in my stomach and it hurts but not when I press down I don't feel preggo either, just constipation, diarrhea sometimes, disgusted by smells, bloating, insomnia. But I don't think I'm preggo becuz I don't feel like it anyone know what to do?