Hi Jessica,

I had a lot of period type pain for basically the whole first trimester, it worried me sick, but I never bled or anything, and I saw a wriggly healthy 13 week old baby at the NT ultrasound O .

The uterus does a lot of stretching/growing in the early days, or it could be the remains of your luteal corpus cyst(prob spelled that wrong), where your egg came out of your ovary.