From 18 weeks felt like small spasms or like a tumbling (is the best i can describe it) below my belly button in the middle. At first i thought muscle spasms as i get them on my legs sometimes, but i never had them in my womb. I keep ignoring it, but now in noticing a patter early mornings and at night i feel them espeically when in maying down relaxing. they said i have anterior and wouldnt gerl anything until 21 weeks but totally confused now if its baby. I have a normal BMI.