TTC #2 but seems impossible ):

My daughter is almost 3 now and me and hubby have been trying for #2 for over 6 months now. It seems like it's going nowhere, we conceived quickly with our daughter but this time it just hasn't happened. We have sex almost every day especially more so when I'm ovulating but nothing, I'm starting to get discouraged since our daughter asks for a baby brother or sister at least 20 times a day ): Any advice would be great!