What's going on

So the beginning of my last period was on the 13th of January, had a week of spotting after didn't take note on how long after my period it was. Started to feel sick and had back pain, hungry and peeing frequently, every symptoms I had with my baby girl. So I decided to take a test 2 days before my period, and it was -. Went to the doctor on the first missed day of period and she told me that everything points to pregnancy and she will do a blood test, well blood tests came back - aswell, still no period, sick as a dog, backs killing me. What the hell is going on? Could it be that I ovulated late and could still be pregnant or is my body just a annoying piece of crap for putting me through this (really want another baby)