What do you use for sore muscles caused my cramps?

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Hi ladies, I'm almost 30 weeks and two days ago I had a terrible cramp in my leg and I am still feeling like the muscle is very sore and tender. I am basically limping for the first several steps whenever I stand up to walk because the muscle is so stiff, and even ones it loosens enough for me to walk normally it still hurts. 
I've heard that deep heat and tiger balm (my normal go tos for muscle pain/stiffness) aren't safe to use when pregnant, so was just wondering if there's anything else safe to use that you find works relieve the muscle pain?