Leg pain

Re

Ladies this has happened like 2/3 times and it hurts bad. I noticed sometimes when I'm sleeping but wake up I get this weird sharp hurtful pain in the back of my leg. It hurts so bad even when I stretch It to see of it goes away or try to massage it. I don't know what this can be but it hurts when it happens. 😲 Does anyone know what this sounds like? Here's where it happens. Btw I'm in third trimester 28 weeks