Night sweats

Sophie • I`m a teacher. My husband is a pharmacist. We have not used bc in 3 years...
Has anyone experienced night sweats as an early sign of pregnancy? For the past few days, it doesn't matter what blanket I use, when I sleep, I sweat. I even sweat in strange places, like on my knees. I don't wear much to bed and we set our temp down a bit so the blankets are cozy. I don't understand why all of a sudden I'm sweating at night.