How old are you? If you're 35 or older, insist that your ob/gyn refer you to a reproductive endocrinologist. Under the age of 35 the rule of thumb is 12 months TTC without success, but over the age of 35 the time period shortens. You'll also probably find out why you're not ovulating (physical, hormonal, etc.) and be given steps to correct the issue.
The other issue is intercourse. When and how frequently are you having sex? Are you starting on about day 9 and having sex every other day? Are you having sex man on top, no thrusting during ejaculation? Are you remaining on your back with legs elevated on a pillow for 30 minutes after intercourse? You should be able to find a ton of information on TTC.
As far as multiples go, yes it is true that Clomid could stimulate several primary follicles which could result in multiples. However, a responsible endocrinologist does not promote the carrying of too many fetuses (sorry Jon and Kate plus 8) if it poses a risk to the mother or the fetuses. If you decide to follow through with fertility treatments, it is likely that you will have bloodwork every other day from about day 5-7 on as well as a transvaginal ultrasound. They are looking for growth of primary follicles and will be able to see exactly how many eggs are developing. Usually they let you look at the US screen and you can see the huge black dots and count for yourself. So, if there are multiples you can decide to inseminate (through natural or intrauterine) or not.
I did 3 years of fertility treatments and would be happy to answer other questions you may have. Secondary infertility affects many women in this country.