pregnant?

Hey ladies need your advice 
Had what I though was my period the 12-16th but it seemed different (I.e. More clots than usual (sorry maybe tmi)) then ever since it ended I am still cramping and have pinches and pulls in my abdomen, my bbs hurt, and have felt little bouts of nausea. I tested yesterday and there is a little line but looks like a total evap and today nothing (did not use first morning urine either day). I guess I just don't know what to do, don't feel ready to go into doctor but I am really confused why I would be cramping this early in my cycle. Did any of you have a period (or what seemed like one) then find out you were pregnant? Did any of you have low hcg for a long period of time ? Thanks for your thoughts 🙏🏼