Late 🤷🏼‍♀️

Hi ladies! So I was supposed to get my period on Friday and it never showed up and still hasn’t 😬. I’ve taken 4 pregnancy tests, 2 which were on Sunday and all of them have come back negative. I would love a second baby but I have a 7 month old and I would have to go back to work early in order to get my hours for another mat leave. I don’t want to miss out on time with my baby. When should I be worried and when should I book a doctors appt to get blood work done? Do you think I’m pregnant?