Are Spotting And Watery And Stringy Discharge Signs Of Pregnancy?

i have a regular 28 day cycle and am trying to conceive, my last period was 7.03.11 so i have 8 days until my next period but i had a bit of spotting on 22.03.11, i have had a mixture of watery and stringy discharge, is there a possibilty that i could be pregnant? im only 21,i already have 2 children,my youngest is only 9 months old