Some times a ovary can't be viewed as it gets hidden behind loop of intestines.However you can view it if CT abdomen is done.
A woman generally has the same chances of conception whether you have one ovary or two, as long as the remaining one is attached to a fallopian tube
The main thing to watch for when you want to get pregnant and only have one ovary is ovulation.
When a woman has two ovaries, they typically take turns releasing an egg every month. If there's only one, then it usually takes over for the missing one and releases an egg each menstrual cycle, and a period should still occur.
There may be some other reason for not getting pregnant.
You can wait for few months more and if unsuccessful still,you can consult your doctor to find the cause for it.