Pregnancy possibility?

Me and my boyfriend had unprotected sex on December 26th and he came inside me. I took Plan B an hour after sex. I started bleeding on the 31st and it felt like a heavy period up until the 4th. I thought nothing of it since that was what the pill was supposed to do. On January 9th, me and my boyfriend had unprotected sex again and came inside me. I took it again that same day. Now TODAY i just had unprotected sex with my boyfriend and he came inside me. I’m currently bleeding just as the plan b i took last week was supposed to do. I’m just really hoping I’m not pregnant, that’s just my main concern. My last period started on December 19th. Should I not take a plan b again today? It seems pretty useless at this point idk.