Birth control after baby

Cheryl • I'm having my second girl due in April💗👶🏻💗
Hi. I had my daughter almost 4 weeks ago and I am breastfeeding only. The nurse told me to wait until 6 weeks to have see but a lot of women on this app seem to be doing it sooner. What kind of birth control are you ladies going on and what is safe to use while breastfeeding? When would I start birth control?