did any other mothers period change after pregnancy. i had baby in March and i had a period in April…

did any other mothers period change after pregnancy. i had baby in March and i had a period in April but have not had one again since. i have started spotting but I'm a bit worried. i am using protection so i don't think I'm pregnant. but is it normal for a person to go a hole month with out a period like that after having the baby and will i get back to having one every month after a while. I'm a first time mom and just concerned.