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Do you know if and when you are ovulating? Thank you.
I would recommend seeing a good infertility doctor.
Perhaps IVF might be needed, but first it's important to know exactly when you ovulate, and to time intercourse so you have it soon before ovulation each month.
A significant part of the problem is likely your age, since fertility decreases markedly after age 35
The spotting suggests some hormonal changes, and that may also be related to not getting pregnant.
I don't think acupuncture is likely to be very helpful.
I also don't think your white discharge is likely to be part of the problem.
Getting pregnant at 39 can be difficult, but it's often possible with the help of a good infertility doctor. Good luck!