I think mine failed and not sure why and just want to hear some people other experience please

I’m just really concerned on how to tell my boyfriend

The only reasons I can think why it failed is because:

-I took it am hour or two late twice

-missed a day but followed instructions on what to do

-drink quite a bit of caffeine

-been taking vitamins morning and night (vitamin c and multipurpose)

I know I made foolish mistakes but I’m new to birth controls and didn’t know what didn’t interact well.

I took a test and got a pos but not sure if I got a faulty one as air of people got false pos from this test