Ultra sounds 2 days apart, is this dangerous?

I was meant to have my 4D scan done last Saturday but they pushed it back a week cause they had to get the scanner fixed. Now I am due for my 3rd trimester well being scan tomorrow morning (to check bumps kidneys) and the 4D scan is on Saturday afternoon. Which is only 2 days apart.
I called the 4D place and they said that is not harmful and they scan only goes for 15 minutes. I have googled and the reports say there is no evidence of it being harmful. These 2 scans will mean that I have had 4 scan all up in this pregnancy so far. First one at 12 weeks, second one at 19 weeks, third one at 28 weeks and the 4D scan 2 days later being the fourth scan. I realise that high risk pregnancies have heaps of scans and they are considered safe, so I am probably worrying about nothing.

thoughts?

I've had scans at 6w, 10w, 13w, 18w, 24w and will have another at 32w.

These don't include the quick checks my OB does at each appointment - I've had about 5 appointments so far.

Both my 18w and 24w scans took place two days before an OB appointment...

I really don't think it's anything to worry about at all, Puppies.

BW

Thanks BW thats comforting.

I think I had 8 or 9 scans all up and two times (so two scans each time) were only a couple of days apart (NT scan booked a day too early & amnio booked a day too early - stupid receptionist!!!). My bub appears to have not suffered any bad effects from this.