I need help

So in September got my period on the third, it was a few days late, then I got it on September 25th. I know weird. So like I thought I would get on Halloween or around those days but didn’t I was like maybe ima little late like I was starting to be. My husband and I had sex this past week without protection but I doubt I was ovulating. But I still don’t get my period and it’s already the 11th 😱😰 I already tested but have come negative. We have a nine month baby who needs all our attention and in the verge of opening a business maybe the stress could have stopped my period I don’t know I’m so worried

Answer-no, I did have a hard time conceiving my baby though that is why I don’t want any type of birth control I’m scared I might struggle again one day