Hello, Nancy! I can certainly relate to your plight; I went through infertility problems and 4 miscarriages for 12 years and I completely understand your concern and anxiety. This opinion may be not be what you are looking for or hoping for in an answer, but remember that the level of anxiety you are currently under only deepens the stress factor. There are so many up and down emotions when you are trying to get pregnant and then reality sets in by way of an unwanted period. Don't let this setback keep you from trudging forward in your attempts, and don't allow future plans to place undue pressure on an already difficult and pressured situation.
I remember how caught up I was in the entire situation and failed to recognize why I was wanting to be pregnant in the first place--being able to love and nurture my own child and the desire to have a family. This also leads to stress between you and your husband from the need to perform and "meeting a deadline." Enjoy this special time that you and your mate are sharing with one another, and allow God to envelope you with peace and a sense of calm. God's timing is always perfect, most definitely when we are in doubt. Remember I Peter 5:7, "Casting ALL of your cares upon Him, for He cares for you."
My prayers and hopes are with you and I look forward to the day when God fulfills the desires of your heart.
~B.~