Am I to early for my baby to show on the ultrasound?

I’m currently pregnant. I’m less than a month. I’m like 2-4 weeks, and I went into the ER for some cramping, and they figured out what it was, but they also couldn’t locate the sac where the baby is supposed to be. Is that normal in early pregnancy ?? Has anyone else had this happen ?? I’m definitely pregnant, but they labeled it as “pregnancy in unknown location” they don’t know if it’s in my uterus or outside the uterus. This is my second pregnancy. This didn’t happen with my first baby, but I also found out at two months with my first, and this time I found out a lot sooner.

This is my first pregnancy, I went to the er at 6 weeks. No fetal pole, no heart beat. Maybe ask a doctor or nurse.