Health Library - Page 12 of 12 - Pregnancy Chance Calculator

Withdrawal method: what the 5 hour rule and research show

November 22, 2025July 28, 2024 by Sam Gorman

Illustration of a woman holding up five fingers beside a “5h” clock badge with the headline “Pull-out & the 5-hour rule”.

Withdrawal can reduce pregnancy risk compared with having no method at all when it is done very carefully, but in real life it fails often. Research suggests that pre ejaculate usually has little or no sperm when there has not been a recent ejaculation, and that some residual sperm in the urethra may decrease over … Read more

Do Ovulation Apps Work? Evidence, Limits & Better Ways to Time Intercourse

November 22, 2025July 9, 2023 by Sam Gorman

Illustration of a woman comparing an ovulation app on her phone with an LH test; headline reads “Do ovulation apps work?”.

Ovulation “prediction” sounds straightforward, until you look at real cycles. Many popular apps lean on calendar maths, but ovulation varies by person and by month. If you already use an ovulation app or you are thinking about one, this guide brings together what studies and guidelines say, where app based predictions can go wrong, and … Read more