8 weeks with twins

Erika

I am 8 weeks today with identical twins (mo di)

Had an ultrasound 2 days ago and heard both heartbeats 153bpm and 156bpm everything measured perfect and looked great.

I started cramping last night and today. Its mild annoying cramps but just want to hear from others if you had cramps around 8 weeks and what causes "normal" pregnancy cramps

Thank you for responding!