Trying to conceive and concerned

My husband and I are trying to conceive our second child. We have been trying for two months going on our third now. My cycles are a regular 26 days with my peak fertile mucus on CD12. We have daily intercourse from CD8-CD13 usually. Should I be concerned that I have not conceived yet? I have timed everything perfectly, and got pregnant with my son very quickly. Any advice would be much appreciated. Thank you!