Morning pill avoids ovulation & due to high dose has disturbing effect on menses. The pill you took on27 was not needed, because there was no chance of ovulation immediately aftewr menses(24...27)
You have taken morning pill twice with a gap of 10 days which should be avoided, insted consult a Gynac , she will start some cyclical treatment for regularising periods, & the medicine will act as contraceptive
Pl. take care. Thank you.