I also had a period 5 weeks after the birth of my son and then nothing for 4 months. Then I had to stop breastfeeding and I was on the mini pill just in case anyway. I went to the doctor and went straight back to my normal pill. That brings you back into a regular cycle. Don't forget you can still get pregnant before your first period comes back, so if you aren't breastfeeding and were on the pill or want to go back on, it's probably a good idea to see your doc and do it now.