Thank you for your query.
The leaking fluid you describe is seminal fluid, which liquifies after some time, and might appear watery.
Regarding your fertile days, if you have a regular 28 day cycle, ovulation occurs on day 14, so for 2 days before and after it, are your fertile days.
If your periods are irregular, you cannot count the fertile days in this manner.
You should use Ovulation Predictor kit
or follicular monitoring for knowing precise dates.
Also, you should get yourself investigated for irregular menstrual bleed.
It could be early pregnancy
which miscarried, stress, anxiety, weight changes, thyroid hormonal
fluctuations or polycystic ovaries
The consultation is all the more important since you are trying to conceive.