Forty you can definitely get the sharp/ligament type pains in the first trimester, in fact I think that's when I got them the most last pregancy.
I'm getting them now and I'm not even 5 weeks.
But they generally seem to be for me when I am moving around, like getting up from a chair or out of bed. If they are more constant and very painful then definitely try to go to EPU.
Sorry for all your worry/pain MrsK but I think pregnancies do move at different speeds this early on (hence the dating scan is when it is). Fingers crossed for you xx