Battling to conceive baby number 1 at age 34.?

Hi

I am 34 and trying to have my first baby. My husband is 38 and fit and healthy.
We have been trying to fall pregnant for 6 months. Of which the last 3 we have used clearblue ovulation predictors to get my ovulation days. But still no luck.

I do however have a strange occurrence every month that has only started since we started trying. At about day 12-14 (just prior to ovulation, I have a 31 day cycle) I have a discharge. A very watery, thin brown type of fluid that lasts 2-3 days. I also sporadically have a pain that I would only imagine to be on or near the left ovary.

I know the doctor knows best but he said I should relax and give it some time and see him in a few months if still no conception.

Just to add to our trouble I have multiple sclerosis & on interefonB (avonex) which I can stay on until conception. My husband had lymphoma 10 years ago and was treated using chemotherapy. But they say chemo effects on sperm motility are not permanent.

Any ideasadvice?