1st month on the pill brown blood 2nd time this month

I'm finished my first pack of pills in 5 days which means my period is gonna be due but as I started my period when I began this pack I just got blackish brown blood for maybe a few days that was the 11th then again on the 22nd and still getting brown blood now not lots but enough to go on a panty liner no cramps or feeling like I'm on my period little confused any info for me please