I feel like I'm pregnant. Help!!

Victoria

So I took a pregnancy test on the 16th and it looked like I had a vvvfl, but I got very light bleeding on the 17th and the 18th it kind of picked up then on the 19th it was barely there. My period only lasted 3 days. Since then I've had slight cramping and I feel kind of crappy. Also my friend from college noticed my breasts look bigger. Idk what to do! I don't want to waste the money on another test, but I want to know ASAP!!! Help? Any advice?