will conception ever happen???

Your posts have relieved some of my frustrations that I havn't concieved yet, I have a daughter of 5yrs in this pregnancy I got caught on the pill, my partner has two children from a previous relationship, but we want a baby of our own, I came off the pill in November 2007, i've been tracking my fertility etc, I know when my fertile days are, but still nothing, my dissapointment is so bad when each month my period arrives on time, apart from last month it was 7days late, I really thought that we had managed to concieve, we bought a test, I peed onto it and waited, I stared at the stick for what seemed like an eternity, to find it came up negative! I cried and cried, 5months later we still havn't concieved and I am beginnig to worry, I know that we can have children as we have 3 children between us from previous relationships, so why isn't it happening to us, I know that I am not alone in feeling like this but all we can do is keep trying and hope for the best, good luck to all you ladies out there who are in the same predicament as me and my partner.