My period keeps coming late

My period keeps coming either a couple of days late or not at all.. I'm worried something may be wrong. I had sex the other night without a condom but he did not cum inside me.. A little nervous as to what is going on but my app says I was only at a 3% risk and he didn't cum inside me so should I just wait it out?

I am going on birth control as soon as my period comes!!!

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