You are seeing this correctly. Yes, this doe Pronghorn antelope had quads. That is four babies. I would not have believed it and thought she was babysitting someone else's little one or two if I had not of seen the four of these little ones underneath the doe nursing.
Incredibly the doe looked to be in good health as did the babies. It is pretty common to see a Pronghorn doe with twins and not unusual to see her with triplets but quads. Not in my 55 years have I seen the likes of this.
The photos are from the summer months and alas, I don't know where they went as I'd love an update photo for you.