I'm in my first trimester and have been getting pelvic girdle pain. It is agony on my right hip on my lower back and a hot water bottle is the only thing that relieved it. I used one a few times last week when I was in week6/7. But now I am feaking out that I have harmed the baby. It was on my lower back. I used it once a day before bed because it hurt most at night. One night I woke up on top of it. Obviously they cool down but it was hot at first. I used it with a cover over my PJ bottoms, which are thin. This has been a very difficult process and I'm so worried that I've made some massive mistake I'll regret forever. Any reassurance?