Feeling so down right now...

Hey ladies, I'm 42yrs old ... Alittle back story about me... Last yr at 41yrs old got my BFP on Valentine's Day all natural tried for 2cycles we gave birth to a beautiful healthy babyboy. Bcuz of my age , my fiancé is 9yrs younger we decided to ttc again well this time is much harder I'm learning. Last month my GYN put me on 50mgs clomid and nothing I got my period 3days ago.... Tomorrow I start 100mgs clomid. I get a positive opk every month so I'm sooo lost by this. I take prenatals like I did last yr. I really thought after giving birth I would be more fertile then ever, guess not. Any advice ladies.