Fertility and pregnancy are linked in part to the frequency of ovulation.

That’s according to a study published in the Proceedings of the National Academy of Sciences that found women who had received a flu shot at the start of the pandemic were twice as likely to get pregnant as those who hadn’t.

And this doesn’t just apply to the flu vaccine itself.

The study also found that men who had been vaccinated at the same time as women also had a higher rate of pregnancy than those who had not.

Researchers from Johns Hopkins University and the University of Florida looked at data from the National Health and Nutrition Examination Survey, a biennial survey of the US population.

They found that in 2010, the average time that a woman was ovulating was 0.7 days after she’d been vaccinated.

So, what does this mean for your fertility?

Fertility is a function of the number of days in a week that your body can ovulate, and in women who are ovulating less frequently, that could mean you’re more likely to have a fallopian tube or fallopian obstruction, or both.

In addition, men who are more likely have a higher likelihood of getting an infection from the flu virus and are less likely to be ovulating.

But what about for your body?

The flu vaccine, like all vaccines, can cause side effects.

These can include: Flu symptoms , which can include nausea, vomiting, and headache. 

Fever and chills that can include fever, sore throat, and cough. 

Chronic fatigue syndrome , which causes muscle pain, muscle weakness, and fatigue. 

Trouble with urination and bowel movements that can cause bloating and abdominal cramping.

Diarrhea and cramps, which can also be caused by the flu and flu symptoms.

Infertility and fertility rates are also affected by age.

A woman’s ovulation is a natural part of her menstrual cycle, and women who become pregnant are usually between the ages of 35 and 44.

For this reason, the National Institutes of Health recommends women age 30 and older get vaccinated.

But if you’re not ovulating, don’t panic.

There are ways to get more frequent ovulation, and that’s by doing some things differently, like:Keeping your bed linen and sheets clean.

Keeping your house smelling fresh and well-sanitized.

And getting some exercise.

Dr. Julie S. O’Neill, a professor of obstetrics and gynecology at the University at Buffalo, said the flu vaccines can help prevent a lot of these problems.

“There is a lot that is going on behind the scenes that is contributing to infertility,” she said.

O’Neill is the author of the book FluVac, and she’s also a clinical assistant professor at the Icahn School of Medicine at Mount Sinai.

She said it’s a lot easier to conceive when you’re physically active.

“There are other things that are more important, but the flu is a huge one for the female reproductive system,” she added.

O’tlanson said she does feel that the flu shot has helped her, but she’s still concerned about her fertility.

She’s worried about how long she’ll be able to get a regular flu shot if she’s not ovating.

She’s also worried about what her baby will look like after birth.

“I’m worried about the way I look,” she told CNN.

“I’ve had a lot to think about.”

This story was produced by CNN Health and CNN.