Period help

I have a question and it is weird but need to ask someone that has had a baby I didn't have a period April or may I had my baby the end of March but did have one in June and July but now I don't have one this month is that normal I took a test to be on the safe side and two of them are negative I just didn't know if this happens cause it is trying to go back normal or what and it has been stressful