I’m 3 days delayed with period but PT negative

So I hooked up with this guy and had sex using condom last September 22nd. As I am a bit paranoid, I waited for October 6th (expected day 1 of my period) to do PT but only able to do it on the 8th. Did it at 4am and turned out negative. My tracker says I am 3 days late today and I normally don’t monitor my period because I am not that sexually active. I can feel every now and then slight cramps in my lower abdomen. And I am so uneasy. Will I ever get my period soon? How to induce it? I don’t wanna get pregnant. Until I completely heal myself and loose all the baggages I have, I’m not ready for a baby. Help.