Help please!!

According to the period app Flo I am 6 days late for my period. My last period was 24th-31st October (my first period since my C-section in August). My husband and I have had sex once since the birth using a condom. For days I have felt like my period is definitely on the way (mood swings and that hard to explain feeling that it’s going to start soon) . Should I be worried?!