I have been having primulut nor 10 mg for the past 3 days , once daily. I started the medication 5 days after my periods were due/delayed after doing a pregnancy test that came negative. I wished to delay my periods and stay on the medication for 10 days but I am experiencing a breakthrough. I had very slight bleeding on my 3rd day of primulut and it has become heavy the following day. Should I increase my dosage if I want to stop the bleeding? I am 22 years old weighing 75 kg and have used primulut last December without any issues.