Pcos & ttc

Hi all....i just wanted to ask. Me and DH have been ttc for 2 years now, doc will not prescribe clomid until my weight is down, so far lost 42lbs with 14lbs to go. In that time my periods came back regular every 30-33 days and now I'm approx 10 days late. I have taken 8 preg tests all BFN and I'm going out my mind coz either im pregnant (yayyyy) and getting false negs or my cycle isn't as regular as I thought therefore no ovulation, no period = back to the start 😦. I thought the more weight I lost then my ovaries would kickstart and work the way they should as this is the lightest I have been since my teens but I'm getting more frustrated tired of constant struggles.....anyone experienced this or can help? Xxx