Do you gals have a cyst on your ovary? I get the same twinges too, but it's because I have a cyst and it acts up when my hormones change. Not saying you do, but may be a cause for confusing symptoms.
I'm still confused if I O'ed or not last weekend with my seemingly positive OPK. One of my (I hate this word, sorry for using it!) nipples was tingly this morning when I woke up and I about panicked! I keep feeling to see if they are sore. I know it'd be too early for that anyway. That was my main pregnancy symptom - they hurt soooo bad.
Taking OPKs a couple times a day, they are still faint. My calendar says I should O in 3 days, but wondering if I will.