Trying to concieve my 2nd baby need tips 💙

Hello everyone I have a 14 months old little boy & currently trying to conceive my 2nd little one which will be our last. We got pregnant quickly within one month but it’s been almost four months of trying for our 2nd and nothing yet. I’m not sure if the preseed lube helped but it seemed like I got pregnant fast shortly after trying it. I always track my ovulation so I can make sure we’re on the right track. Has it taken anyone else longer to get pregnant with their 2nd child? If so what seemed to help?