Could this be pregnancy?

Okay my period is 5 days late, yesterday i started what i think is spotting because its way lighter than normal, im usually on time and a heavy bleeder and this is like barely wipes on my pad very very light. Anyways how many of you have ended up pregnant and have this happen to you or similar. I just want to know if there is a shot this could definitely be pregnancy or if im just going to end up either getting my period or im just having a weird period this month...