Period maybe or Maybe not

The whole month of July I didn’t have my period. I took a home pregnancy test and a blood test all negative. On my birthday July 24 I had sex with my boyfriend the condom broke and I took a plan b the next day. The month of August 3 comes and I start to stop the same day my period is suppose to come. I am spotting. My period last for 4 days and all I am doing is spotting. It is August 8 and the spotting stops. Then August 9 and the spotting starts again and it has not stopped. I don’t know what to do. Every test I take it is negative. I don’t what wrong with me. I just want to know if I’m pregnant or am I not. What should I do?