Late period

So I took an emergency contraceptive two weeks ago because I was scared about getting pregnant. I had unprotected sex but we didn’t finish, and after I took the pill I’ve been feeling bloated, nauseous, and gassy. Also I know that a side effect is change in period, but my period has been late for 2 days and I took a pregnancy test today and it was negative. Honestly I’m kind of freaking out so pls help