Worried about this months period

My last period ended on March 30th and then I skipped a cycle.  I got my period a couple of days ago, but this time it's different.  My cramps don't feel the same and my boobs have been really sore (I usually don't get sore boob during my period).  Also my period blood is very bright red and not as heavy and dark as my usual periods.  It's heavy enough to wear a tampon though.  I've done research on the Internet and I'm freaking my self out!  Has anyone had this happen to them before??  What is going on?