advice?

Cassawndra

My last period was February 1, 2018. I haven't missed my period in years. We were trying to get pregnant and I THINK we did. but, I tested March 3-15 and still got negative tests. When should I test again and when should I give up? We want this so bad. My first and only pregnancy was in 2008 so I'm a little out of touch on the waiting game.