Aiyoo, I'm so sorry you're going through this! 6 weeks postpartum leg pain and heaviness is pretty common, hormones still messing with your body, plus if you've been standing a lot or kena blood clots risk je, but definitely better check with your doctor soon, especially if it's one leg more swollen or ada redness/warmth, okay? A few mum friends I know had the same complaint and it settled down after a few weeks, but better safe than sorry lah.