There's a possibility that you could be pregnant, it would be too early to detect on a home test if you stopped birth control on the 18th, you may have ovulated sometime after that and won't know from a home test until late this month! Home tests generally detect from 4 weeks on. Or, it also could be the birth control messing with your cycle, and you just need time for it to regulate!

okay, thank you!

It could, every woman is different so perhaps something that would take exclusive breastfeeding for one woman can happen to another woman with only occasional breastfeeding.....I would still go see your doctor though, tell him or her what's up and he can run some tests if he thinks it's abnormal....

we do both formula/breastfeeding. would that still mess with it? he is more formula fed now.

Are you breastfeeding? If so, the hormones released can mess with your period and make it wacky, you could feel like you're starting your period but then not....you can have a period one month and not the next etc.