Aww momshie, light spotting during pregnancy can happen for a few reasons, sometimes it's just cervical irritation or from a recent check-up, pero honestly, kahit konti lang, mas better na i-report mo agad sa OB mo para ma-check properly, lalo na at 20 weeks ka na. A few of my mum friends had spotting din during pregnancy at naging okay, pero importante talaga na documented sa doctor para sa peace of mind mo at para ma-monitor kung may underlying concern. Don't panic, but do reach out to your OB ASAP, better safe than sorry tayo dito!