Is my gf pregnant?

She had her last period on September 23rd....It is already october 26th...yesterday she said she was spotting a little bit, a bit less and brighter than her last period, but no signs of brown...but today she said she had as much blood as a normal period. she also said she has a headache and is experiencing mild cramps. On top of that, she said that sometimes when she goes to the bathroom, she doesn't leak out anything, even though she has the urge to go. She has not taken a home pregnancy test, but she will tomorrow. We had sex about 2 weeks ago (oct. 15th?) and used a condom...is it possible she is pregnant or is this a sign of stress? This month has been really hard on her for school, work, family issues...so im not sure and i would like to see what other people have to say...personally i think she is pregant because she seems to fit most of the symptoms of early signs, but still, there is a lot of doubt around the whole issue

any hope would be appriciated

thanks!