Is this normal in early pregnancy.?

My last period was Aug. 26 through the 30. I've kept up with my period for a little over a year and I've never missed a month and I always started Two weeks later on the same day I ovulated. I ovulated Sept. 10th then the exact same day the next week I spotted (I spotted til the 19th) I was supposed to start on the 24th of Sept. I'm now 12 days late and have been running a low grade fever, having low back aches, and tired. I don't have food cravings yet but I am hormonal. Anyone did this and ran fever.? Is it normal.?