Pregnancy

Sooo my fiancé and I are trying to have a baby, my period was supposed to come on the 31st instead the entire week before the 31st I been discharging a LOT and on the 31st I put a tampon on but I got like maybe 3 spots of light pink blood and nothing else and a few days before that I spotted once and it went away too ... I threw up yesterday and I took a pregnancy test no positive could I be pregnant ?