Blood clots with late period. Suggest!

Hi doctors, My periods usually comes after 28 days. My period date was 27 October but I got period on 1st November for one night then stopped. And then started on 3rd November and continue till now. It is something different from my normal period. It's like maroon  blood clots. When I go for toilet it comes out that time also. And when I cough . I feel like something comes out. It's not normally bleeding. It's blood clots are there. Actually we had done unprotected  sex last month. So we have been taking  pills INTIMACY PLUS for last two months to avoid pregnancy . And I am taking it regularly  . And I stop when period starts. So last time I took it on 31st October. It's composition INTIMACY plus 2 desogestrel bp 0.15 mg Ethinylestradiol IP 0.02 mg So why is happening like this. Why blood clots are still coming out . Not feeling pain much. Should I change medicine . Or which medicine to start now Pls suggest