Good evening. We planned for a baby for 1.5 years and here we are ?? I…

Good evening. We planned for a baby for 1.5 years and here we are ?? I found out on the first day of delay that I was pregnant, the period is 3 weeks (embryonic period), there's a pulling sensation in my lower abdomen like during menstruation. I went for an ultrasound, they said it's just a uterine pregnancy, nothing is visible yet, they called me for a follow-up ultrasound in 2-3 weeks. I read that this is normal at early stages. But I would like to know until what period do the pains considered normal? How did others experience it? Please calm me down ??