Am I Pregnant or is it just a messed up period?

Ok so I started my most recent period on May 18th and It last up to June 8th. Through out it was very light. I rarely had to use a panty liner during it because it was so light. The blood would be at times brownish looking and then at other times it would be fresh. I got off my period on june the 8th. A week and two days later I started again. Only Im bleeding less than I was on my last period. Ive been having unprotected sex. I dont think Im pregnant but im not sure. One of my friends told me it was a possibility considering my periods are usually heavy to medium. I usually have to use two maxi pads at a time. But not these past two periods. So I just wanted to get some opinions on what other people think. Thank you,