Nervous

I haven’t had a period since June 6th. I went to the doctors on August 9th and they said I wasn’t pregnant. Went back on the 15th they said it looked like I had a cyst. Told me to come back by the end of September and she would give me something to start my period. Went October 4th, and the doctor did a pap and then felt my cervix and said they felt soft and had me take a test and these are the results I got. I’m so excited, but also scared. I didn’t know I could become pregnant with my period. Even though I did have brown spotting for about a week maybe almost a week and half. I go back today to get a ultrasound. I’m having fears that there might not be anything there. With my son I never had this fear. But, I wasn’t trying for my son. I was trying for this baby. Someone tell me is it normal to get pregnant and not have a full period? I’m trying to be positive just scared.