Hi,
Thanks for the query.
If you miss the pill and take two pills in the next day complete protection can be expected as per the manufacturers.
Taking the pills at the same time everyday will increase the percentage of protection.
If you take the pill three hours after the expected time the efficacy can decrease to some extent.
But still
oral pills are having very high protection rate. So the possibility of
pregnancy is less.
Back pain etc can occur as side effect of pills.
So you better wait, possibly you will get the periods as usual.
Take care.