What is happening ?? Sorry for the long post

Hey guys.

Okay, my period came last week and only lasted for three days, which is so strange because my period is usually heavy (like extremely heavy). What I experienced over the three days was light blood, which barely filled my pad (suppose it was more like spotting looking back). I don’t know if it was implantation bleeding, probably not, but it was strange. When I wiped today I noticed light blood- my period comes every 5 weeks, and is extremely heavy. So my next period wasn’t due to next week. It’s confusing I know, but I’m wondering if my period is coming early today, why did it come for only 3 days last week? Considering this has never ever happened to me (EVER) and of course this would happen to confuse me when me and my hubby are trying for a baby🙄. My period could be a bit late but it’s really heavy, with pains. But for this I have nothing only tender breasts and a sore head. Confused isn’t the word. I’m not sure what is happening.