Annoyed and depressed now

I have been charting and feeling up my good parts as well as doing the deed on all the obvious days which is a lot and while neurotically taking my pregnancy test tonight (third BFN today) I saw a small light bloody clot. Assuming I will start AF soon. I am just so beside myself. What am I doing wrong? I don't understand. I KNOW in my heart God wants me to have another or this yearning wouldn't be so overflowing in my mind but why haven't I achieved success yet?!? :( pondering. Will sleep sad tonight.