When I was about 18 weeks pregnant, I got severe pains in my lower stomach and tops of my legs. I went to my doctor who sent me straight to the hospital because babies heart beat was grand etc and she could see exactly wat was wrong because they hadnt got the scan machine
when I got to the hospital, they did a scan etc and said everything was grand and the baby was just lying on a nerve on my left side which was causing the extreme pain. I felt stupid but this is my 1st pregnancy and wanted to make sure.
Its more than likely nothing but you should just get checked just to make sure and put your mind at ease. Better to be safe than sorry.
My pain went away after 2/3 days.