Hi . I Had Unprotective Sex 3 Weeks Ago .

Hi . I had unprotective sex 3 weeks ago . Last week I felt nausea every day , temperature rising and going back down m lower back pain , heart burn , burping and farting a lot more than usual headaches and tender breasts . 3 days ago I started spotting . First small amount of very light pink blood then small amounts of brown blood . This lasted for two days . I am due on my period in just a week . Do theses symptoms point towards being pregnant ?