Early symptoms question!!!

Devon
Im not sure how any DPO I am. Got positive opk last week and had EWCM. Just got cleared by my doctor Friday the 19th after going through 3 months of hell after a miscarriage in April. I feel like it would be too good to be true but I just feel weird. My lower back is so soo sore. Constant lower back aches and just tired. My temp the past couple days has been a little higher and going up. I'm praying it stays going up. Every morning I just hope when I temp! My nipples have been sensitive too since last Wednesday. I had sex the 20th, 21st, 23rd, and 24th. Anyone have lower back pain as an early pregnancy symptom? I feel like I remember from my last one before I miscarried. Trying to wait to test until Friday.