So frustrating!

I am really starting to get discouraged to the point where I just want to give up on baby #2! With my first I wasn't even TTC. I am happy for everyone who succeeds but at the same time I think why not me. I could have sworn last month I had implantation bleeding along with a few other symptoms especially when AF never showed. I am 3 weeks late now almost with negative tests, although I haven't test in 2 weeks. My cervical position hasn't changed at all either. I am starting to think maybe my bipolar medication has something to do with it?