Can I Get Pregnant Post Unprotected Sex Despite Having Emergency Pill?

hi doc m 22 year female my menses date was 1st mayand i had an unprotected sex on 11th may for the very first time i had sex and he didnt ejaculated in me for the precaution i took an emergency pill within 72 hours but the very next day i got nausea sickness n abdominal pain doc says m aving gasterioritis then i was worried about my menses so i took dubolt-n to prepone it then i got menses on 26th may and i took UPT five times all rnegative but m still worried is there any chances of pregnancy