It's been a while, maybe you just don't remember? Could be both have taken too, so maybe you're stretching more due to twins....?
My first, I had cramping from 4-6 weeks. It was quite painful at first and gradully eased off.
This time not so much cramping, bu tspotting at 4 weeks and bleeding at 5 & 6 weeks. Only ever had one emby transferred though.
Glad to hear your hubby is so great