Placebo pills

Lola • I`m 24, happily married, have a 16 month old baby girl. I got pregnant on the pill, not TTC but ready for babybooz#2
I'm on day 4 of placebo pills, second month of taking the pill. I've been crampy and having all the symptoms of a period but no bleeding. I take the pill at the same time every day, never missed one. I did start the second pack earlier (day 4 last cycle) could that be why I'm not having a period?