Period Length

Kory
I have been on about 5 or 6 different birth control pills trying to manage my PMS symtopms. One I tried shorten my period and another made them very light. 
I recently switched to the patch and my patch change day is Tuesday since one accidentally came off. 
Since then, I noticed there is less and less time between when my period would normally start and when it starts now. Usually it would start on Thursday after I removed my patch or took a sugar pill on Sunday. Is this normal? 
Also, my periods are heavier on the first day but taper off...it never makes it to the pad/liner during the last couple of days but I am bleeding. Is that normal?