sex and my period

i recently had sex for the first time and the app is telling me i'm supposed to start my period tomorrow. i usually ALWAYS start at least a day earlier than the app tells me going to. did having sex with my boyfriend on June 6th have anything with my period not coming early like it usually does? we used a condom and i don't even think he cummed so i doubt pregnancy is even a possibility. i just really need help because now i'm sorta freaking out...