Hello! My last period started on April 27. Because I had a delay in th...

Hello! My last period started on April 27. Because I had a delay in this cycle, on June 1 I did several tests — all showed a faint second line. I had an hCG blood test that same day; the level was 33.8. I also had an ultrasound that day — nothing visible yet. On June 2 I had another hCG test. The result was 38.8 (the increase in one day was very small). I've had lower abdominal pain for two days, but it's not strong and comes and goes. Today (June 3) I did another test — still a faint second line. I don't understand whether I'm pregnant or not. If I am, isn't the hCG too low, and is it normal to have lower abdominal pain? I'm really worried.