Without knowing your deficiency, you're either taking a comically meaningless dose (why even bother to take a 5ug dose if you're at a 250ug deficiency?) or risking overdose by swamping your system with the 250ug over the counter pills while not actually being deficient.
Your fear of overdose is misfounded. You have to try really hard. Deficiency, on the other hand, is endemic.
"Vitamin D deficiency is a major public health problem worldwide in all age groups, even in those residing in countries with low latitude, where it was generally assumed that UV radiation was adequate enough to prevent this deficiency, and in industrialized countries, where vitamin D fortification has been implemented now for years."
The problem is: Doctors will only test for _suspected_ deficiencies. I'd love to know my vitamin levels, but I don't believe my doctor would be as enthusiastic about multiple blood tests to satisfy my curiosity.
Typical supplement dosages: from 5ug to 25ug
So no, unless you eat Vit D supplement like candy you won't have a problem