might be pregnant?

Nina
hey everyone so I started the nuva ring on August 2 and took plan B that same day for sex I had 5 days prior. On August 4 and 5th, I had unprotected sex with my boyfriend using the withdrawal method (with no plan B). For the rest of the month, my ring had been working and so on August 22nd I had unprotected sex with my boyfriend and he came inside, but I figured I was still protected with the ring. The next day, I took out my ring because the 3 weeks were up but he came inside me while we were having sex that day. I was reading stuff online how the nuva ring still protects me for the week it's not inside, but I took Plan B the next day just in case. My period is 5 days late now... but two of my cheap pregnancy tests came out negative. Is it possible that I'm pregnant?