Implantation bleeding?

emma

i had unprotected sex on july 4, and right after i took a plan b. i haven’t had any side effects until july 12 when i felt like i was gonna pass out and i felt really lightheaded. yesterday i started spotting light red and brown. and cramping. my period isn’t suppose for almost 2 weeks. should i test? or is it just side effects of the plan b?