TTC for baby number 3

Vanessa

So hubby and I have 2 gorgeous boys. 1st baby took about 6 months to fall pregnant and second bub was first month off contraception. We are TTC for baby No3 and it’s been 4 months now with tracking cycle and LH, only start BBT this month and as much as I know it sounds stupid I’m feeling a bit discouraged probably because our second was so quick! I’m 37 in feb so wondering if my age is the issue. How long would you suggest trying for before seeing the Dr?