Light cramps and irregular period, Could this be a sign of pregnancy?

For the past 3 months i have been having light periods that last for up to 3 days or sometimes it ends earlier than that. also sometime my period would go away and then lata on that day it would show up again but it would be a brownish red color and very light.AND throughout these 3 months i have been having light cramps like every day or sometimes at least once a day but they happen very alot. Im startin to think im pregnant but im not to sure , but i did have un protected and i am tryin to have a baby but im not sure if this is a sign of pregnancy, can anyone help me!