? I am so confused ok so i started my period on october 30 and ened on november 3 no i ahd sex on the 31 od october. I have started feeling sick to my stomach but no throwing up i am 18 and not sure if i could be pregnant is it possible? i had sex on my period. im not sure hwat my cycle is i mean theses are the last three months

august 24- 28
septemebr 26-30
october 30- nov. 3

There is really no pattern i am not sure if i could have been ovulating when we had sex but im not sure please let me know so i can get a test i really need to know soi can try eatting healthier