11 Days Late

Hey guys I’m 11 days late, never been this late in my life before. In fact I’m always on the dot of what my tracker says I am. I’ve taken 3 pregnancy tests and all negative. What should I do? This month my fiancé and I had sex once and he didn’t finish at all however I’m sure there was precum... so that kind of worries me 😂😂 best advice? Just drank parsley tea in hopes it’ll help me menstruate.