Hi just wondering if i could get some advice.

i have pcos and dont get periods, My doctor started me on Primolute to give me a period and then 25mg of clomid to take days 2-6. i took the meds as prescribed by my doc. i had a blood test on day 21 of my cycle to see if i ovulated and it came back negative. i am due to take my 2nd round of clomid and have had my dose upped to 50mg. I havnt had my period yet, it is nearly 1 week late. without my period i cant take the clomid. I rang the doc and he told me to take a pregnancy test just to check, i have taken 2 home tests and both are negative. i am just waiting for the doc to send me a prescription on primolute so i can get my period. for the last few weeks i have been having headaches, sore lower back, pain in my lower stomach (like period pain) and dizzy spells also my discharge has been slightly heavier, like i am ovulating. These symptoms have been making me think my period is about to come but nothing is happening. I know these are symptoms of taking clomid but should i still get them even though its been nearly a month since my last pill. has anyone else been through this and why would the doc ask for a pregnancy test if he knows i havnt ovulated? Any help would be appreciated.

thank you, lots of baby dust to you all.