I had a normal period in August 25-29 then had unprotected sex on sept 9th and 15th and my partner came inside me . I have not had a period since the but on Saturday October 20th I started spotting and it was extremely light and I had that for two days .I took a pregnancy test on October 11th that was negative and I'm also having light itching in my vagina . So could I be pregnant or what may be happening with me . Please help