Hi, I'm 15 weeks on Tuesday, and last night I woke up with the worst lower back pain and it's been persistent all day. It's a nagging, painful, sore back ache that radiates from the middle of my lower back to the outsides of my hips. It reminds me of my period back cramps I used to get. I know my body is stretching and muscles are changing- but I'd just like to hear from someone else that's feeling the same.