Feeling down

This is our 4th month ttc. Trust me, I know that’s nothing compared to a lot of couples, but something just feels wrong. I already have two children and we conceived both of them VERY soon after trying, and this time, we just aren’t having luck. We BD pretty much every day during our fertile window and even in the days leading up to and following it. I’m in my TWW now and just not feeling confident at all. My cm looks super fertile now but my period is due in a week and is never late by more than a day or two. Of course we’re going to bd tonight too just in case. I’m just wondering if my progesterone is low or something. This will be our last baby and o just REALLY REALLY want it to happen. I’m only writing this post to vent to you ladies and ask for positive vibes and prayers, as I’m always sending mine your way too!