Um...

I’m on BC and we use condoms AND spermicidal lube. I started my placebo pills this past Sunday and I have yet to start my period. The only thing my boyfriend and I have done without a condom has been a simple in once and then out with him joking with me. I don’t think I’m pregnant but I want to know if anyone else has had this problem. I started BC a few months ago and never skipped a period before this.