8th week of preg, involuntary spasms/thrusting while on my back

[Hedgehead]

I am 7 weeks 3 days preg with my first child. I am starting to have this strange thing when I'm in bed and on my back where my pelvis thrusts forward and my muscles (in my bum and stomach) tense up, almost to compensate for changes.

I am assuming this must be ligaments getting a little looser?

I had twinges then - not when lying down but yes, they made my muscles act weirdly! That is the time it all starts to move about.

thank you Squizita!