I am not sure, you could only ring and ask? GP can refer for obstetric ultrasounds as well. The hospital ones would be open, but if it can put you mind at ease, it could be worth a try.

I have to head out now for half an hour, but like I said if you want to email me I can give you my mobile, before I go and if you need any help, or want someone to go with you etc ( I am sure you have family etc, but just so you know you are not alone with your DH away) just let me know