if you've been trying to get pregnant and it's been over a year and you are without success, then it's time to see a specialist. You've got something going on that's preventing pregnancy.
Who knew that TTC would be so exhausting! It seems like most REs want you to TTC for at least a year before seeking help - at least 6 months if you are 35+ years. It is up to you though. Are you using a digital monitor? I tend to have very little temp shifts and the monitor helped me better id when I was going to O. Before I went to the RE I had lots of charts, was using the OPKs, herbs to help regulate my cycle, etc. and I felt overwhelmed and confused. Everyone is different, but I felt better when they were testing b\c I felt like if they found a problem or could tell me what I was doing wrong, we'd be able to fix it\work on fixing it. As it turns out, I have unexplained infertility. But I still feel better having the reassurance that we are not missing O and I am developing eggs, etc. Good luck!
In the end, I think it's a pretty personal decision whether or not you should be looking into getting help but personally, I would. What have you got to lose?