advice

Jordan • First time mom❤️ army wife 😍
I've been told by different people that you should not use a heating pad while pregnant.  My lower back is killing me I'm not sure if it's because I'm pregnant (I'm only 4 weeks 3 days) or if it was from stress.   
 Idk what to do since I'm now limited to things I can take. This is my first pregnancy and since we don't plan on announcing it yet I can't ask any family members.      In your opinion is it ok to use a heating pad while pregnant?  And is it ok to take hot baths?   I'm desperate for just a little relief!!