Late period

I’m 17 almost 18 I’m still in school my boyfriend and I had sex twice we used a condom but my period is late one app says by 2 days but this app says by 6 I’ve had a bunch of different symptoms that made me think I could be pregnant so I took a test last night it was negative but I’m still worried I passed it off as my body reacting to having sex but I’ve used different toys before so I assume my body would be used to it...any advice?