If your cervix is "low," meaning just a few inches from your vaginal opening, that means you probably aren't ovulating. If it's "high," located deep within the vagina, you may be ovulating. The first few times you feel your cervix, it will be difficult to determine whether it's high or low. Keep feeling every day over the course of a month or two, noting the differences in the position of your cervix from week to week. Eventually you'll be able to tell whether your cervix is low or high. If your cervix is firm and tight, you probably aren't ovulating. If it's soft and has some give, you may be ovulating. The texture of the cervix during ovulation has been described as feeling like a pair of lips. During other periods, before and after ovulation, it's more like the tip of your nose - slightly hard with less give. During ovulation, the cervix will feel very wet with fluids, and you'll likely have an increased amount of vaginal discharge. After ovulation, the cervix will feel drier until menstruation occurs. In addition to feeling your cervix,  monitoring your cervical fluids and recording your basal temperature can help you figure out when you're ovulating. This combination of tracking methods is called fertility awareness, and done correctly, it's an effective way to determine when you are fertile. That said, it is not very effective if you want to prevent pregnancy.  Just before and during ovulation, your vaginal fluid will become heavy and slippery. When ovulation occurs, your basal temperature will rise slightly. It's necessary to take your temperature using a basal thermometer every morning so that you catch the rise in temperature.  Always use protection if you're looking to prevent pregnancy.

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Write a summary of the previous text in Vietnamese:
Xác định vị trí cổ tử cung. Phân biệt cổ tử cung mềm hay cứng. Khi nào cổ tử cung ướt. Sử dụng các phương pháp khác để biết bạn có đang rụng trứng hay không.