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Clomid only working sometimes?

Hi,
So I’ve just finished my third cycle of clomid but I’m getting concerned that it’s not working at all. I’m on Clomid for PCOS. 
It worked the first time on 50mg (I ovulated and the nurse said it was a ‘good’ ovulation. Second time, nothing! Upped the dose to 100 for third cycle and had to get a blood test on days 21, 28 (apparently levels raised a little on this day) and 35 but just had phone call to take 150mg starting today. 
I was so sure I’d ovulated as I’ve had mild cramp and lower back ache this week :( 
Confused as to how it can work perfectly first time but not again! Anyone else had similar issues? 
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