Shot to the pill

So I lost my insurance and was due for a birth control shot, I cannot afford $100 visit plus cost of the shot. I have an old pack of birth control pills I got them in December… would it be safe to take them if they are not expired? I had plans on switching to the pill anyway.. I have switched birth controls in the past with no issue, the dr doesn’t really ask questions just prescribes the other birth control.. so I figure it’ll be fine. I just need someone to tell me it will be before I do it