Long, heavy period after beginning birth control

Patient: I started the combined contraceptive pill Cilest on the first day of my period, as instructed. It’s 14 days later and I haven’t stopped bleeding; in fact, it’s getting heavier. I realise I need to wait it out to let my body get used to it but what exactly is happening and will it stop or get worse when I finish the pack for my 7-day break? I’m going on holiday and really didn’t want to be bleeding.

Symptoms: Menstrual bleeding, cramps