Missed period and sex

I’ve been on Junel Fe for 6 months and I’ve never missed my period. Lately I’ve been more sexually active but we have been very safe (condoms and pulling out combined) and usually my period starts on day 3 of my placebo pills but I’m on day 5 now and my period still hasn’t started. I took a pregnancy test yesterday just to make sure and it was negative.

Is it possible that having more sex threw off my hormones and had an effect on my cycle?