Konda, It is not normal for your cycle to stretch to 35 days just because you are TTC. 35 days are however still at the outside edge of a normal cycle.
Your doctor will not consider infertility before you tried to conceive for at least a year. 85% on couples trying to get pregnant will be successful after 12 months.
A normal ovulation calendar does not help when this happens. You will have to use an ovulation detection kit or learn to determine your ovulation using basal body temperature (BBT), cervical mucus observation and cervical position. Normally you can use these things to determine ovulation using computer software, either on your own PC or on a web site. Search for "Fertility Awareness Method" (or FAM) on the interwebs.
Your only other option is to just have sex every 2 days. That can get pretty old very quickly and can become work, not fun if you do not watch out.
Best of luck with TTC!