lighter period than normal??

For this month and last month my period had been lighter than usual and is slighter a shorter amount of time. I usually get a pretty heavy period and bright red color and now it's more to a regular or lighter period and darker color. One day was kinda heavy but the rest were more regular. Also my period usually last 7 days, but the last month was around 6(I'm not 100%sure about this month yet though). My boyfriend never cums inside me and we always wear a condom. But I'm worried I might be pregnant?? Also my period had arrived much earlier these past two months than I am used to however my period is very irregular.