Definitely normal. I got the most horrific pain at 19 weeks that the hospital got me to go in for. It was ligament stretching. Was told to rest with heat packs etc and see how it goes. It gave me grief on and off for a few weeks but has never been as bad as it was initially. the midwife also told me that it would get worse so i was a wee bit panicky as I couldn't work (because I couldn't walk). Touch wood, but so far so good. Hope it eases up for you soon.