When is it Labor?

Annabel • "For this child I have prayed..." 🛐✝
I have extreme lower back pain and hip/pelvic pressure and occasional BH. Me and hubby just had sex and my contractions are now every 3-5 minutes. Baby is moving still. No water breaking. EXTREME increase in discharge though. I'm 37+4. Should I call once pain is unbearable? I'm also 90%, 3cm and -1 station as of two days ago.