First time mom here

Hi! question lang I am already delayed for 1 month na and I tried to get a PT twice and it is positive the. my friends ask me to habe a check to Ob then I went to ob but unfortunately the ob didnt do any ultrasound that day instead she gave me a vitamins such as follic and calcium. And she resched me to go back for the ultrasound. I am just wandering why the ob did not have an ultrasound that day to make sure that it is confirmed and the baby is alright. need your expert opinion on this matter. Thank you