Unprotected sex is never safe as each woman is different with her cycle. She can try ovulation kits to track her ovulation date, but remember, there is always a risk if you have sex 3-5 days before her ovulation date or if the test happens to somehow be wrong. Be ready for a potential unplanned pregnancy if you decide to go this route.
Completely untrue. Some women are late ovulators and others are early ovulators. Even if she was a day ten ovulator, she could get pregnant if you had unprotected sex on day five (as in five days from the start of her period), six, seven, eight, nine, or ten. But that's assuming she ovulates on day ten. The average is actually day 7 at present, but again, that is an average, which means that a large amount of different numbers were added, divided, and came out to 7--not that every woman ovulates on day 7. There is no safe time to have unprotected sex because every woman is different.
Is this as per ovulation tests or guesstimating? If she ovulates somewhere between days 14 and 16 of her cycle, avoid unprotected sex from day 9 onward. But again, don't be surprised if you ever end up with an unexpected pregnancy. This method is far from foolproof.
Assuming you are 100% correct 100% of the time, yes, but again, this is not an exact science as the human body can and will fluctuate from month to month. She can still end up pregnant if her body does this.
If you want to have unprotected sex without so much risk of an unplanned pregnancy, I would recommend utilizing the birth control pill daily at the same time with a cell phone alarm for reminder. It is 99% effective when used correctly, which is quite a higher percentage than this method you are relying on. If you both don't mind the risk of an unplanned pregnancy, by all means carry on.
You are correct in that a woman can only get pregnant when she ovulates, but always remember that sperm can live inside her body 3-5 days, which is why it's so risky. Be sure to note that day one of her cycle is the day her period starts.
Unfortunately, no other method is guaranteed anywhere near as highly as a properly used condom or properly used birth control. Even if you were to use this plus, say, the withdrawal method, there would still be a chance as pre-ejaculate can contain sperm.
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