Were you cramping?

A • Living the dream. 5 year old boy, 4 year old girl, b/g twins on the way!! What a surprise!! Due in December!
I'm not sure if I have twins, there were two gestational sacs and two yolk sacs, but this cramping is unbelievable. No bleeding. Just cramping like never before with my other two. I'm 5+4 today. Anyone else had this before you knew it was twins? No other symptoms really besides kinda sore breasts/nipples and some very mild nausea.