Help me ttc

Ok so I am ttc and when I fell pregnant with my first it took my body 2 weeks after my period was due to come up positive.. I'm due tomorrow and no sign however I have been off the jab for 2 months now so wondering is it the jab because 2 months being off or is it because my body will most likely do the same show two weeks late again help please help!!! I've taken a test and it was negative!!