Late Period

So I’ve been on birth control since I was 19, I just turned 24 this last March. Last month my cycle was a week late, and I am currently two days late for this cycle. My and my husband want to start TTC later this year, and this irregularity has me concerned I will not be fertile. Normally I am regular as a clock, but not these last two month. If anyone has any idea of what it may mean, I would appreciate some input! I’m just paranoid about fertility the longer I’ve been on BC.