Heat packs while TTC

Renae • 💙 '09....💙 '11....💔 '14.... 💔 '14....💔 '15....💔 '16....💔 '17....💜 12/12/17
Just wondering if using heat packs while TTC is safe?? I've had a lot of back pain, cramping and I also get sciatic in my left hip....and over the counter stuff isn't helping. Any advice would b great