I am 21 years old and under the treatment of pcos. I used to take dronis20 since february18. I used to have regular periods and the flow is heavy. This month I had periods on 10th of June and the flow is mild and continued for 4-5 days. I had sex on 21st, 24th,26th of June and 1st of July. Again I started bleeding on 25th of June and this time the flow is too mild and the period is continuing for more than 5 days. Is there any chance of pregnancy? What's the cause behind this? Please help me with a relevant answer.