Does it mean Labour will start ina dew days ?

Serena

I’m 38 weeks and have a constant back ache tha comes on and stays for a hour or too then disappears and comes back again later during the day it feels like preassure and achey feeling and sumtimes feels like period cramps and sumtimes makes me feel nauseous?? Is this my body getting ready or does it mean I might go before 40 weeks