I am 15 dpo, and not due for another 3-4 days (trying to conceive) today i started getting an odd watery discharge. should i still take a test or not?

Maybe: A serum pregnancy test will be more accurate at this stage. Over the counter pregnancy tests may or may not give an accurate result until 1 to 2 days from now.

Maybe: The thin watery discharge might be the normal change in mucus when you are ovulating, and could be a sign that you are fertile. Mucus changes throughout the cycle, if the thin mucus can be stretched between your fingers this is called spinnbarkheit and is evidence of a fertile time period. Take your test and see what you are.

No reason not to: A thin watery discharge (similar to uncooked egg white) is often the sign of high estrogen levels, which occur around the time of ovulation. After ovulation and with pregnancy, the discharge is usually thick and whitish. The discharge might mean that your ovulation is late this month and your period will be, also. Many women use ovulation predictor kits to better determine their most fertile time.