False positives or getting pregnant without periods???

Bambi💜💗🍼 • With the man of my dreams and ready for baby number 5! Which happens to finally be our girl! We are truly excited!
Ok so my baby is 5months old. I have been waiting to have a period so i can start my birth control. Was going with pills bit since i am breastfeeding i wanted to make sure my period was back. Well i had a spot in april or may but not a period and well now i have 8 of these and freaking out on how its possible before my period even came back or how do i even track to find out when i could have or how many weeks or what???!!! 😮😮😮😮😮😮😮😯😯😯😯Some help but no negative bs! I am also having some serious kidney pain and not really cramps but like heavy gas pains in my abdominal. I know i need to go see a dr but was wondering opinions first...