here is the advise I give my friends in your situation.
It has worked 8 out of 10 times....
stop going to the doctors, stop reading books and getting your self all complicated about this very natural desire and female ability.
Fall in love with your husband again, get out of townon weekends,bring a few bottles of wine and some candles... screw your brains out! enjoy it for the the value of the love and the sex too...have fun with it, stop calculating, measuring, pondering...having unprotected sex creates babys...
having spekulated formulated tense pregnancy intended fornication creates worries and kills future intimacy with your hubby.
become playful and loose, nothing worthwhile was ever created by a serious human being. and you are creating the most playful thing of all : LIFE
have fun