I would go Ells, it will be busy being Friday night so be prepared for waiting around but if it were me, with your sister having a clot before too i would have to get checked.
Did they say what 'other symptoms' to keep an eye out for?
Swelling, pain getting worse or very hot to touch where the pain is. Or generally feeling unwell. I've rang A&E and they said waiting time at the minute is 4-5 hours, they understand my worry and said to rest the leg and if possible hold off until Monday for the scan as they can't scan this weekend but if there's any increase in pain or even worry then I can come over any time and get a Clexane injection which is what I will have to get if it is a clot. So I am going to rest the leg now and see how it is tomorrow instead of going to sit for hours at this time of night.
Ells thats very worrying I hope you'll be ok
Thats a dreadful wait to expect a pregnant woman to go through xx