35 & TTC

Turned 35 last year & my husband & I trying to TTC for baby #2, but because of my ‘age’ I’m hesitant to keep trying. Three attempts & still no luck. I’ve taken ovulation test strips to pin point ovulation day, still no luck. I’m such a pessimistic person I just think of the worse & end up stressing myself out, I somehow think something is wrong with me. Is it my age? We’ve tried 3 months, is that enough to be worried or am I just putting too much pressure & stress for myself? Any advice would be helpful & encouraging.