Hi, I Am 32 Year Old Female. I Had Been

Hi,
I am 32 year old female. I had been trying for child for almost 7-8 months now. I have been taking - Fertisure, L Folinine and Glycomet daily as advised by my gynecologist. While i have PCOs and I took medication for it two months back, My periods have been fairly normal ( Mostly on time - 3-4 days). In March - I was on fertility pills. starting D3 i tool Clomiphene. On D10 my doctor gave me a closer to my ovulation day to increase chances of pregnancy. After my ovulation day I was suggested to take susten 200. I took pregnancy test twice but it was negative.
2 days prior to my date of period i got my periods on 4th April. The flow was heavy as its there on first day. Second day morning, there was nothing just few clots which is surprising as it has never happened before. Yesterday and today i have experienced spotting ( mostly brown). I have been feeling exhausted over last few days and yesterday was extremely nauseated. Can i still be pregnant? If No, what could be the reason for this change?