Is a pelvic ultrasound transvaginal and can it show pregnancy?

Also  will it show a pregnancy if I had intercourse one month ago? (I don't know how many weeks that makes me because I don't know when my last period was it was weird) They told me to empty my bladder one hour before and then fill it before I come so I have a full bladder which seems kinda weird to me. So if I'm pregnant will they be able to see anything even if it's not transvaginal?