3 week ultrasound.

ttc for rainbow baby • My husband and I have been together 7 years. Married since Aug 2014. We started ttc in July 15 and got pregnant first month and it ended in an ectopic. We are now waiting for our rainbow baby .
Has anyone had a 3 week ultrasound betore? I am high risk and having pains that I shouldn't be having. Going in for an ultrasound today at 3. Will they be able to see anything?