Trying to conceive rainbow baby


Hi everyone I'm 40 and already have a 16 year old. Me and my partner have been trying for a baby for over a year. I had a miscarriage back in 2007. This would be my partners first child. I have tried using ovulation sticks etc. What I'm wanting to know is where do I go for help and advice. I've been to my doctors in the past and was told as I'm still having my time of the month I'm still ovulating and that was that. I know as you get older your chances of conceiving are lower. Can anyone point me in the right direction on what to do next. I'm in the uk