i need reassurance

so i’m 18 and my boyfriend and i both have pretty high sex drives, meaning that we’re going at it ALL THE TIME. we use a condom every single time and it hasn’t broken but my period was supposed to start today and it hasn’t yet. i’m very regular and always start in the morning when i wake up so i’m starting to freak out. i just got over a cold so my cycle may have been thrown off. i was told its highly unlikely that i’m pregnant but i’m terrified right now and i need a second opinion. i’m a pre-law student and a baby would ruin my life