@SarahGen-- It's not possible to know for sure without seeing a doctor and getting a glucose tolerance test.
Symptoms of diabetes are increased thirst, frequent urination and sudden weight loss. See your doctor right away if you have these symptoms. Since you have family members with diabetes, you ought to get checked out anyway.
There are many other causes of frequent urination in women though, so it's best not to jump to conclusions. Urinary tract infections can be common in women and frequent urination is a symptom for example. Even something like drinking more coffee or taking a diuretic medication can cause frequent urination. So this symptom doesn't necessarily mean that you're ill. Just keep an eye on it.