![Menstrual irregularities and vaginal bleeding after COVID-19 vaccination reported to v-safe active surveillance, USA in December, 2020–January, 2022: an observational cohort study - The Lancet Digital Health Menstrual irregularities and vaginal bleeding after COVID-19 vaccination reported to v-safe active surveillance, USA in December, 2020–January, 2022: an observational cohort study - The Lancet Digital Health](https://www.thelancet.com/cms/attachment/776e81f3-6014-483e-b2d7-b5182c8a94a1/gr1.jpg)
Menstrual irregularities and vaginal bleeding after COVID-19 vaccination reported to v-safe active surveillance, USA in December, 2020–January, 2022: an observational cohort study - The Lancet Digital Health
![Ovulation and Safe Period: What is the Safe Period to Have Sex? | How to Calculate the Time of Ovulation? Ovulation and Safe Period: What is the Safe Period to Have Sex? | How to Calculate the Time of Ovulation?](https://s3.amazonaws.com/images.icliniq.com/article/Article/Safe+period-2.jpg)
Ovulation and Safe Period: What is the Safe Period to Have Sex? | How to Calculate the Time of Ovulation?
![Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles | npj Digital Medicine Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles | npj Digital Medicine](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41746-019-0152-7/MediaObjects/41746_2019_152_Fig1_HTML.png)
Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles | npj Digital Medicine
![Timing of Sexual Intercourse in Relation to Ovulation — Effects on the Probability of Conception, Survival of the Pregnancy, and Sex of the Baby | NEJM Timing of Sexual Intercourse in Relation to Ovulation — Effects on the Probability of Conception, Survival of the Pregnancy, and Sex of the Baby | NEJM](https://www.nejm.org/na101/home/literatum/publisher/mms/journals/content/nejm/1995/nejm_1995.333.issue-23/nejm199512073332301/production/images/img_medium/nejm199512073332301_f1.jpeg)