Odd Ovulator???

Shannon
I have been getting my period normally every month since I was 10 years old! Never skipped a month, always been normal. 
Just this past year I have been getting my periods now every 34-35 days. It used to be every 28 on the dot!  Now my periods are longer in between. I have been TTC for about 2 years now on and off, and really trying the past three months.  I've even used clear blue self ovulation kit that pin pointed my most fertile days. Also, I look up every month fertile trackers and ovulation trackers.  Some say different fertile times.  It's so hard to actually have sex every single time the chart says because that's just now how life works! Lol. We are busy people and we have been trying to get it right and even done it on the most fertile days and it just doesn't seem to be working.  Any opinions or advice on the different fertile times? Or is anyone else like this? I'm only 26 years old and I'm not sure if this is normal for my periods to change like this. Thank u! ?