Gynae prob. Cause and what should i do.

Hello. I am on ttc for 8 months with letoval 2.5 mg twice from 3 to 7 days and duphaston twice for 16 to 25 day for 4 months. I had regular periods on 30 to 32 days which becsme 28 th day on this cycle. i have done folliculometry which shows ovarian follicles on 10 th day 17 × 13 mm. As I am not conceiving I had hsg last month 30 th september. My lmp was 23rd september. After hsg i had bleeding which lasted for 4 days. My gynae gave me clingen forte. After which the brownish mucus discharge subsided. On 23 rd october all of a sudden I had a bit of bfown mucus with no further bleeding or any there after or before pms. i waited for five days took hpt negative after 7 days done blood hcg less than .1. Today is 12 th day and even now i didnot get periods. my periods was due on 23 rd oct. this month i didnot take any medicine except ovigyn dsr and eltroxin 75 and amlodipin 10. what can be the cause and what should i do. Did the hsg delay my periods. My husbands reports are also fine.