Question about pregnancy

Is there a way to know if I'm pregnant sooner before my expected period I'm suppose to
​Get in 4 days but I'm so nervous nos I just broke up with my boyfriend today but I'm afraid I might be pregnant we had sex around my ovulation day and he cum inside me I know is a big mistake I didn't protect myself I live him so much and trusted him now I don't know what to
​Think this is going to be the longest days ever