Worried and confused

I have been ttc for well over a year now and it's been about 5 months since my miscarriage. My husband and I have finally come to terms with not having kids just yet and have decided to get on birth control. My appointment was made about 2 weeks ago and it's in 2 days,this Monday. BUT my period is late! I am so worried that now we have this whole plan to the next few years without kids and I am very worried that I may finally be pregnant instead. It sounds silly to be upset about it but I am just very worried. How do I deal with this feeling? I've been wanting a baby for so long so it seems horrible to say I don't want one and then possibly be pregnant. Thoughts??