pregnant? HELP ASAP!!!!!

My last period was June 23rd, I was supposed to start my period July 19th, and I never did. Today I was supposed to start my period again and I didn't. The last time I took a test was about 2 weeks ago and 3 came back neg. Also I noticed my boobs have been really sore lately, today when me and my SO had sex I spotted a little tiny tiny bit, but haven't bleed sense and my discharge is whitish. Anybody else have these problems and ended up being pregnant?