Mid cycle bleeding

Patient: I have been taking yasmin contraceptive pill for approx 6-8 months…….during the last 2 months I have start bleeding very heavily on approx day12 and I’m now on day 21 at the end of the packet and still bleeding…enough so that towels are being saturated within an hr and tampons are rendering useless….should I be worried about this?….I am a 42yr old mother of 3 teenagers..