Bad lower back pain @ 38 w

Currently 38w and before this i dont really suffer bad back pain, or just a mild one on and off. But tonight im having a bad lower back pain to the point i cant even sleep at all. Keep tossing and turning and trying to do stretching, massaging my back all doesnt work. Is there anything that can help lessen the pain ? How i wish i can just spam salonpas or yoko yoko on my back 😭 #FTM