Pre seed opinion

I NEED OPINIONS !!!

So me and my fiancé are ttc and I was recommended pre seed by a friend and she said “ it worked so well for so many ppl that I know if it don’t work for you, you might wanna get checked for any issues” IM WORRIED THAT IM GOING TO USE IT AND ITS NOT GOING TO WORK THEN IM REALLY GOING TO THINK SOMETHING IS WRONG WITH ME !!! What do I do ????