Help! I need advice

ryn

I got my first positives at 11 dpo they were all dye stealers and showed fast. I had my first ultrasound at 15dpo ( idk why they decided to do one on my first appointment ) they didn’t see anything not even a sac so they have been running blood work to check for ectopic pregnancy. I’ve beeen really nervous. Is it normal to not have a sec early in pregnancy? With my son I didn’t have my first ultrasound till 8 weeks.