Swelling

34 weeks yesterday and so far hadn’t had any swelling in my feet. A little bit in my hands/fingers but not noticeable to anyone but me really. Last night we had a few ppl over for a bbq so I was on my feet quite a bit. By the end of the night my feet were throbbing and looked like this.....

I’m relatively thin and my feet are a size 6 so they look like they’ve doubled in size! You can even see the imprints from my sandals. They’ve gone down a bit this morning but still a bit swollen and sore. I’m having an ultrasound tomorrow morning and they have obstetricians there. Am I fine to wait until then to have it checked out do you think? As of last week my blood pressure was completely fine.....