3d/4d ultrasound

I had my appointment scheduled for 30weeks on the 28th and they called and canceled because of the virus and they shut down but I am so set on this ultrasound considering I had it with my first baby so I seriously called a state away were there have not been any cases at all of the virus and scheduled the appointment 😂😂 lets just say im hard headed is there much difference in the babies features at 28 weeks I got mine done at 31 weeks with my last baby