Missed 2 Cerezzette Pills I Took One Of The Missed

Missed 2 cerezzette pills I took one of the missed pills and the day I remebered pill had sex the next day,five days later (sat)having period like pains no bleeding and twinges in my lower back still having them now (mon night) is there a chance I couls be pregnant or is that just the effect of missing a pill thank you