Ovulation is when your ovary releases an egg into the fallopian tube in preparation for fertilization, implantation, and pregnancy. This happens around the thirteenth day of your cycle. The days of your cycle are calculated as the first day of your period being day one. Given that the average period is 5-10 days long, ovulation occurs 3-8 days after the last day of your period. When your ovary releases the egg, some women can feel it as a slight twinge, to mild cramp in the lower back. Most women do not feel anything. After your period, and during ovulation, your discharge often changes to a clear fluid similar in consistency to an egg white. Doctors believe this change in discharge texture helps the sperm in semen more easily swim to reach the waiting egg. There are plenty of ovulation calculator but I highly recommended this Ovulation Calendar Calculator
The previous poster was correct in saying there is no real need to keep track of ovulation unless you are trying to become pregnant. The egg released will stay there waiting to be fertilized for the rest of your cycle. When your next period comes, it is because your body knows the egg has not been fertilized, so the egg, and the lining of the uterus are shed to start the cycle over again.
Yes, it's absolutely possible that you are having a long cycle!
I normally have a 28 day cycle but this month ovulated on CD 25, three days before my expected periods. I know that this is when I ovulated because I was using opks and charting my basal body temperature.
Now, I'm not 100% that you have fertile CM... The stretchiness is promising, but (at least for me) fertile CM is thin and slippery as well as stretchy. It's also usually almost clear. I recommend you Ovulation Calculator through this you get instant of knowledge about Ovulation .