A pelvic exam and you might get an ultrasound.... I say might because your only 4 weeks and most of the time they wait until closer to ten weeks for an ultrasound. And FYI.... If you get one it will be vaginal and incredibly uncomfortable.
Where I'm from most obs don't usually see you till your 8 wks and first visit is lots of questions and family history, urine dip and blood work and then they will usually see you back in a month and that's when they do the ultra sound. Every ob is different though so it's hard to say but that's been my experience with my pregnancies.
Thank you both for the information!