How long to wait? So my husband and I have been trying for a few months now and it's always a bfn. I…

How long to wait?

So my husband and I have been trying for a few months now and it's always a bfn. I know this is relatively short in comparison to how long some people have been waiting, but I'm sure you all understand how each month that passes gets sadder and sadder. :/ so I was wondering, how long should I wait before I go see a dr? I have pretty regular cycles and from my charting it looks like I am ovulating. I have noticed low temperatures but I don't know if that means anything. It just doesn't make sense when bd is timed so perfectly for it to be a bfn month after month.