Pre seed and pregnancy!

So me and my husband have been trying to get pregnant for about 6 months now. But still haven’t been able to have any luck at all! I don’t want to say that we are trying to hard, and everyone says “just stop trying!” But it’s just not that easy! (Which I’m sure you all know) a friend of mine got pregnant using pre seed (or she thinks it helps a lot). So we bought it and have been using it to. Do y’all have any pointers for me at all? I tested 2 days before I started with a negative. Should I wait and see if I miss a period?