Pregnancy possibility?

So my last period started 2/26 and ended on 3/3. I had sex with a condom on 3/8 but the first one we used we were having a problem with. I was supposedly ovulating on 3/15? And then on 3/17 I noticed a light brown discharge at work! Could I be pregnant, because I googled this and it said the discharge could have been implantation bleeding. Help please!!!