Pregnancy with second child

Brandy

I have a one year old child and now I'm trying for my second but I was wondering does pregnancy test come back sooner with your second child? The first day of my last period was June 10 through the 14th and I ovulated 24th through the 29th and I had unprotected and we r trying to get pregnant but It happened from the 18 though the 29th can I be pregnant and how soon can a pregnancy test tell