Pregnant or not


So I’ve exclusively breastfed my lo up until he was 13months. The last month and a half, he’s barely nursed. So last month I had my first period since feb2017. My husband and I have been intimate a lot and only most fertile days last month. I should have started my period yesterday , but nada. Not even signs of a period. I’m just not sure if my body is trying to find it’s way back to normalcy or what?? Any one have any idea? I did take a test yesterday and it was negative... 🤷🏻‍♀️🤷🏻‍♀️