Calf cramps during the night

Hey in 24.2 weeks today. Lately every single night I have cramps that begin in my calf's and my thighs on the side that in laying on. I only have ever slept on my sides and with my other pregnancies ive never had this problem. Sometimes I wonder if it is because I weigh the most i have ever weighed right now. It wakes me up at night and I have to toss and turn all night to stop it on one leg but then start it on another. Maybe time for a new bed? Too much weight? Bad blood circulation? I always am active so idk anyone else dealing with these problems??!!