I have been pretty - probably too - active in the 2nd trimester of pregnancy but according to MW all going well healthwise with baby and me. Am 27 weeks tomorrow and yesterday for the 1st time ever had a sudden really bad stitch/ache across lower bump and internally that felt like one of my internal organs were about to explode and I found it hard to walk for about half an hour. Since then pain eased off but whole lower half of bump feels sore and tender and this milder pain kept waking me up during the night. Is this just totally normal? And if so what causing it? And should I just spend a day on the sofa or are there exercises I can do to ease the pain? Thanks for any advice offered.