Welcome back to healthcare magic Physician's desk!
No medicine can improve or decrease the amount of semen although so many sources make various promises, so the drug is not the cause for this.
The amount of semen hardly matters but it's quality does.
If you are having more frequent sex in the want of pregnancy
then the amount will go down.
At 38 yrs being pregnant has certain health risks of elderly gravida, please consult your gynecologist before you get pregnant.
I think the advise would be helpful for you.
If you still have queries if any, please feel free to communicate back.
Wish you a great heath.