Tomorrow is exactly 39 weeks, I've been having pain in my lower abdome…

Tomorrow is exactly 39 weeks, I've been having pain in my lower abdomen for two days now, short and sharp pains, the baby has quieted down, it pulls at my waist, yesterday my stomach hurt like during periods, pulling... I'm going to the maternity ward, anyone encountered something similar? The humidity is high, and like mucus, but more watery, with a sour smell, the diaper is often wet, water hasn't gone away, the plug too... could these be labor?