Thank you both so much for replies and reassurance that it is normal. I really am trying not to stress but hard when so close to end of 1st trimester... I know that pains on either side of uterus are most likely round ligament pains but wasn't sure about the middle tum. So that has put my mind at rest. x
Probably just your uterus stretching to accomodate the little one! Quite normal.
You'll have to be extra careful when standing up from sitting or lying down, as well as when you turn over in bed at night because this can trigger those pains to be pretty intense. Just get up slowly and roll over slowly when you're in bed. Nothing you can do to prevent them, but you can prevent some of the more intense ones if you move slowly in those instances.
Sounds like you are getting some ligament stretching pinches. I experienced those around 12 weeks and am currently 23 weeks.