I just started Clomid too... I had my +opk on Sunday. I use the Clearblue Easy Digital opks; they give a smiley face when positive. On Monday, I had the worse cramps; it felt like someone punched me in the stomach. It was painful on both sides so I'm hoping that something came down my good side (my left tube). I think it is a good sign when you feel the Clomid working; making everything fluttery. I still have after effects of fluttering; very faint compared to Monday, so I'm keeping hopeful. I'm dpo3; we can wait together.
Let me know how you're feeling. I'm very bloaty! But it's worth it.
DJ~