Help can't poop...

Laura

I'm 2 weeks pp and I can't poop... tmi but omg it hurts and last time I went I bled...I take colace twice a day, drink water, drink prune juice and orange juice and no relief... can I take a natural laxative? I'm breastfeeding and giving formula due to not having sufficient milk... How long would the laxative get out of my system in order for me to breast feed again??? I desperately need help going to the loo.... :(