Okay ladies I'm a bit confused , I'm never poorly or feeling sick , apart from morning sickness once…

Okay ladies I'm a bit confused , I'm never poorly or feeling sick , apart from morning sickness once in the morning every day I'm absolutely fine ! , but yesterday and this morning I just feel 'Bleugh!' I feel off.. I feel like I need to be sick constantly but there's nothing coming up , I also have a really sore belly (diahorrea) any ideas what this could be ? :(