Curious..

I'm 9 DPO the last 4 days or so I've been having these awful back pains as well as leg pains?? It feels like I've been doing mile runs even though I've been laying down most of the time 7 and 8 DPO I had mild cramping then nothing as of this morning. Af isn't do until Friday, I've had 9 miscarriages and three babies and I've never experienced symptoms like these this early. Could I be pregnant? And before you tell me to take a test I took one this morning and I believe it's negative but I also know it could still be early