Discharge and intermittent cramping

GS

Hi baby friends. This is oddly specific. Currently 5w 4d. The past week, I have experienced sharp stabbing discomfort (like lightening crotch near the end of pregnancy). It’s only happened twice, both times after lifting my 35lb son. Approximately 30 mins after, I have yellow discharge. Any other time, it’s clear or white. I’m wondering, has anyone else has experienced this or something similar?