HELP PLEASE

So I'm just over 5 weeks and just got off the sofa and had massive stabbing pain in my stomach, think it was lower abdomen, it made me bowl over in pain. As soon as it came it went. I do normally get stretching pains when I get up but not to that extent. In in the UK so we don't get to have an ultrasound until 12weeks so no idea if things are ok! Has anyone had similar? Is it normal or should I be concerned?! Thanks