Pressure upper abomen

About 3 days ago i started to get this pressure in the upper part of my abdomen it hits for a split sec the goes away. Idk if i may be pregnant cuz i got what i thought was my period, it started way early and it was really weird flow. If i am pregnant i would be 5 weeks i know its way to early to feel any movement but i was wondering if any one else has experienced anything like this?