Jellyfish Cervical Mucus, Breast Tenderness, and Back Pain

Day Three of Clomid...

I woke up early this morning to breast tenderness and back pain. I was also welcomed by what I call, jellyfish cervical mucus. It's just what it sounds like. I heard clomid drys many women up, maybe that will kick in after all the pills are over. So far no mood swings or hot flashes. This round of clomid at 100mg is already very different from my first round at 50mg. 

I also want to start testing with OPKs (ovulation predictor kits). Anyone know when it's safe to start testing? I don't want a false positive. Either way I have my cheap Wondfos ready.