Y’all I’m scared. Plz help

vc

So 2 months ago I switch my pill. This one is a lower dose because my last one was giving me migraines. I didn’t get my period the first month I was on the new period, but I knew that was common with switching pills. Now I’m on my 4th placebo pill and still haven’t got my period. I had very light bleeding in my panties earlier but that’s it. I haven’t been sexually active either because my boyfriends in basic training lol. Is this normal?