I had sex with my boyfriend two days after I finished my period. we used a condom but it broke as he was finishing and pulling out. so I took a plan b within 30-40 minutes after the accident. now it's been 4 days since & I noticed I was bleeding while peeing & I have cramps. does this mean I'm not pregnant or is it just side effects?

I'm not supposed to ovulate for another week & I'm not supposed to get my period till July 18