If I remember correctly, it did usually start pretty quickly after the active pills, but my periods while I was on BCP were always SO light and sometimes nonexistent. It may have been the kind I took though, I took Yaz.
I'm sorry you are having such a long period, I hate that!
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"Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up." - Galatians 6:9

TTC on our own for over 2 years
Dx with Severe MFI- Blood work shows no Microdeletion and no CF mutations
Ultrasound scheduled 3/22- DONE! Everything looks normal, other than some cysts on my right ovary.
HSG scheduled 4/14- DONE! Tubes are clear!!

On BCP until our IVF w/ICSI scheduled for August!!!