Back ache? ๐Ÿ˜ฉ๐Ÿ˜ฌ๐Ÿ˜”

Nicole
Is there any type of cream/ heat pads you can use during pregnancy? My lower back has been in complete agony for over a week now and a hot water bottle is doing nothing! I'm 5 and a half months and barely have any sign of a bump so why does it hurt so bad? ๐Ÿ˜‚ I have deep heat and deep heat pads at home which I haven't used as I've been told you can't.  Please help lol!