Hi, My Name Is Amber, I Had Unprotected Sex On

Hi, my name is Amber, I had unprotected sex on August- 29-2015 in the midnight, a few days later my vagina was hurting because i haven`t had sex in a year, my vagina was itching but it`s not itching anymore it stopped after 3 days. when i was fingering myslf there was white liquid coming out of me i guess that`s my sperm september-9-2015 i started seeing a little blood on my panties not heavy but light pink and light red, with a little blood clot on the tissue, and i been wearing a tampon, the tampon isn`t full of blood just small amount of blood with a clot, but no blood in toilet, now today its getting lighter and pinker. i took the plan b pill wtin 72 hours when i had unprotected sex. my boyfriend told me on wednesday that he`d been sleeping a lot lately and he said i might be pregnant. can you tell me whats going on?