Oh and I want to add that to help you figure out your ovulation you can use a simple math equation, but it only works if you are regular and know when your next period will come.
Unless you have a typical 28-day cycle you will not always ovulate 2 weeks after your period starts. The truth is that you will ovulate two weeks BEFORE your next period. So if you have longer cycles use this equation:
CYCLE LENGTH - 14 = (estimated) OVULATION DATE
For example my cycles were 32 days long.
32 - 14 = 18
I would ovulate on or about CD18.
Hope that helps!
You only ovulate once a cycle- the last day of EWCM is the day you ovulate. So you won't know you've ovulated except in retro-spect. That's why it is important to have sex anytime you have cervical discharge (it helps keep the sperm alive as well) since you won't know the last day until it has passed. Good luck!