Late periods this month. In coimbatore?

Hi, I got my last period on 19 Jan 2016 and the next period on 05 Mar 2016 with less flow and today I got little brown discharge, has intercourse with husband last night, is there anything to worry? Want to know my ovulation dates as we are trying for baby since Jan 2016. I have been calculating the ovulation dates through online calculator with first date of last period, I am not sure if it is correct, but I get a window of 7 days for ovulation period but again it might be incorrect too. I want to know how do we test PCOS? Through blood tests? Where can I get them done in Coimbatore? I am from Pune and new to Coimbatore. Also, I need to get Pap smear done. Can you suggest a good and experienced gynaecologist since I am new to this place. Thankyou.