8 WEEKS PREGNANT & NOTHING ON ULTRASOUND

I started spotting for 2 days like it was my period but only when I would go pee. Before that happened I found out I was pregnant and today I went to see my OBGYN for the first appointment and I told her about it and she said it seemed normal and when she did the vaginal ultrasound she said okay I do see that you have some spotting going on but on the ultrasound she didn’t find a sac and nothing strange in the ultrasound other then she didn’t see the sac. She gave me some prenatal to take and I had to get some blood work done. Wondering if this is normal and if you ladies been through this??