I've had endometriosis over 20 years and with the pill back to back, I probably had a cycle every 3 to 4 months. It's changed these past 6 months. Now every month I have a cycle while continuing the pill and it can last 2 weeks straight. This past week, I starting bleeding on a Monday, then a light period for the week which stopped on Friday. Now today, Saturday, I'm starting all over again with super large clots and heavy, heavy bleeding. Is this normal?