Hello. I am a 27 y/o female. I had my regular period in august from 3-8th. Somehow I had one again in the same month from 28-2nd sep. On 9th sep I had emergency contraceptive which led to my period on sep 24-28. On aug 7th I had protected intercourse (which as per my tracking app was the first fertile day). Now as per the app my net period was supposed to be on 23 oct which never arrived. I did have symptoms (tender breasts and pain in the lower back on the day it was due but no bleeding ). I have also lost around 5 kilos in sept and have been stressed about missing my period. Please let me know if I should be worried.