i'm a little worried at the moment.. i haven't felt the baby move very much at all last night.. usually its really active at night time but i only felt it 2 times and once this morning .. i am going for the 18/19wk scan tomorrow so i will be able to see if its ok.. but should i be worried??

I had a massive pain in the stomach last night.. but i have also been very gassy and constipated and i am thinking i might have strained myself going to the loo yesterday.. so i'm hoping its just that.

Should i contact someone??