Time to give up?

Triclynn
Starting to wonder if it's time to give up on this hope of a 3rd baby.  My husband & I have no kids together and have had 3 MC's, 2 1/2 years since the last, we have been trying ttc for 6 months. Give up or do I stick with my doctors appt next week? Just turned 38 so maybe it's time to give up. It shouldn't be this hard!!