I started my period 4 days early?!

I got up this morning and felt a gush and for sure it was my period! I'm only on cycle day 29 right now and I usually start at 33! Below I attached my periods but OCTOBER MONTH MY CYCLE WAS 33 DAYS!! Glow says 28 but it isn't.. Ideas?! It wasn't as bright as usual,lighter red but a lot of it!