no symptoms whatsoever

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Just wondering... I'm on the pill, but I went 36 hours without a pill about a week ago... my placebo pills started on Saturday and it is now Monday. My period usually doesn't start until day 5 of placebo pills so I'm not actually late but I have NO pms symptoms? I usually am very tired, headaches, cramps, extreme hunger, bloating and back pain but I feel completely normal. Would it be likely that the missed pill has actually resulted in pregnancy and the reason i have no Pms symptoms is because my period isn't coming? Did anyone else have no symptoms of their period and it ended up being pregnancy?