BM's

Hi all, I'm 14+1 and since BFP my BM's have been on and off very loose to actual diarrhoea .... today is a really bad day - it's horrible basically water and been three times already ! On a normal day there is just no form to it and I go 3-4 times! I never know from one time to the next how it's going to be! What I eat makes absolutely no difference is either! I have heard of constipation but seriously!! Anyone else!? x