It really isn't the excedrin, I was in the same boat as you me and my husband were ttc and it was almost a year I started to think that something was wrong but then I prayed and said if it is the Lords will for us t have a baby he will bless is when he is ready and I just got my BFP saturday. I also get migraines pretty often and I take excedrin migraine and I am pregnant so that can't be it. Just like onlyme27 said just have faith!
It seems like the harder you try the less likely you are tog et pregnant. That is how it worked for me. We had been trying to get pregnant. The we bought a house and decided to take a break from it until our finacial situation got more stable. Then less than a week after we moved in I found out I was already preggers. It's funny how things work out like that. Don't stress over it. When it is time, it will happen. Just have faith.
I was the same way with mine. We had been trying for a long time and nothing. And we had intercourse alot as well as during my ovulating time. But then when he came home from iraq after 5 months of being apart the next thing i know im pregnant. I think what it has to be is maybe dont try to hard. I mean we tried, but when he came home we both decided that if it happened it happened, we werent gonna get the exact day that i was ovulating (even though i knew when i was because he came home right when i was about to end my period). I wouldnt take it as neither one of you can have children. If you are worried go to the doctors and have them check both of you out. Other then that just let it go. Dont concentrate on it so hard, just go with the flow.