If you are breast feeding you may not have a period until after you have finished breast feeding and your milk has dried up.If you aren't breast feeding then depending on how quickly your hormone levels return to normal usually 2-6 months
It took me about 6 weeks. If you go for longer than 10 weeks I would call a doctor and see what they think. You can also get pregnant again before even getting a period so use protection if you don't want to get pregnant that soon.
This varies, each female is different, each pregnancy is different. After you have your after birth period. It can average from 4 to 8 weeks before you start again. Your body needs to adjust to all the major changes it has gone thru. Also, hormones play a big part in all this. TALK to your DOCTOR. It is very important to let your physican know. If he/she does not listen, do not give up be persistant or just get a second opinion.