Help me please!

So Ive been ttc for about 2 years and I had my first period in 4 months with provera the 6th-16th, I was supposed to ovulate on the 25th but I never got a positive opk. I am 6 dpo. Is it possible I still ovulated and just didnt realize it. I am having extreme fatigue, back aches, head aches, and im nauseous. Could I still have conceived? And also how soon can I test? im also concerned I might be having a miscarriage since my back pain is so bad.