Irregular period

I'm 19, I just wanted to know if anyone has experienced this, and would be able to give me some thoughts about what's going on with my body. I recently had my "period" it actually came 2 weeks early and was super light, not even a panty liner had anything on it, it mostly only showed when I wiped. Honestly my period is very consistent and I have a heavy flow and have been that way ever since my first period. I've honestly never experienced my period this way before I'm not on birth control so I took a pregnancy test and it was negative. I'm very confused on what's going on and I know most will say to go to the doctor but I wanted to see if anyone has had something similar happen. I've never been pregnant before so I'm not sure if this could be an early sign of pregnancy. If for others thos was their first "symptom" when should I test again? I'm not sure if I should be concerned I was going to wait to see if next months period is back to normal and if it isnt I was going to schedule a doctor's appointment. Hope you guys can give me some advice I appreciate it!