Urgent help needed about contraceptive pill!!!!!!!!!!

How to take contraceptive pill? 
1. If I'm breastfeeding ? Doc said I won't have period if I'm breast feeding so these pills are for 28 days. Then when should I next take the pills?
2. I had a baby 1.5 month ago. My bleeding was stopped and I'm supposed to start my contraceptive pill from today !... But suddenly I have started to bleed again!... 
So can I take my pills though I'm bleeding??
Please help !!.. I'm ftm!😞