Post baby period

Just wanting some experiences from other ladies with how long things took to really go back to normal. Had my first period about 9 months after DD was born, habe been very irregular since. The first few were quite far apart, then went to every two weeks for a while, then I thought they were getting more normal but have bone back to about every three weeks. DD is 15 months and gave up the last bit of breastfeeding last month, had only been doing one feed a day since I went back to work at 4 months.