TTC strange OPK readings?

I'm currently 6 dpo and I continue taking my OPK's since I have plenty of them. Since what I marked as ovulation I have had at least three dark (possible positive) opk's. I am wondering what this could mean. I have also been having what could possible be pregnancy signs/symptoms since 4dpo. The symptoms I have experienced so far are. Slight tender bbs, cramping/twinging in my uterus, backache, headache and extremely Thick and creamy CM that has no scent at all. My husband and I have been married for 7 months and we really want out bundle of joy finally. Looking forward to honest and respectful answers.