Dr. Natalie Crawford: Female Hormone Health, Fertility & Vitality

Cannabis, right, decreases sperm production, decreases sperm motility, changes sperm morphology (the shape of it), changes the DNA—it increases the fragmentation of the DNA. If your partner uses cannabis, and you get pregnant, you have a higher chance of miscarriage because of the sperm association with the cannabis.

You can't live in a toxin-free world, but choosing what you put in and on your body on a regular basis does set the tone for certain physiologic changes ... Your laundry detergent—what scents are in your laundry detergent? Shampoo and conditioner are a big one, and the soaps that you use on a day-to-day basis in your house or the oils you put on your body.

Daily intercourse is associated with the highest chance of fecundability, especially during the fertile window. However, for couples who are not sex-every-day people, that idea can cause a lot of stress. Stress, of course, impacts the system in a lot of different ways...

In general, your period should be less than 35 days apart. And you should be able to look at a calendar, and with your finger, put a finger on the date, and within a couple days of accuracy be able to predict when your periods coming. And if you can't, there could likely be something that is interfering with the hormonal signals between the brain and the ovary.

Having your period, you know, 10 to 20 years ago, you will see most data would say 13 to 15 would have been kind of the average age. And now we're really seeing it shift to be starting at 10 to 11 and completing by 13/14. So, most girls are definitely going through the puberty change earlier.

Breast milk exposure, at least for the first 6 months of a child's life, certainly helps with the immune system development—and we know that poor immune development can lead to higher risk of autoimmune disease later, what people call leaky gut, and some of those diseases certainly are correlated with fertility.

We know that when you go into menopause or you run out of eggs, and you're now in a low estrogen phase, we see a lot more of a depressed mood and anhedonia, lack of response to things, which would normally give you pleasure happens more frequently. The female brain loves estrogen, and it's protective against things like dementia.

You'll hear most reproductive endocrinologists say your period's a vital sign ... The regularity at which it comes and the predictability of it is telling us if your hormones are all communicating in a normal fashion or something could potentially be off.

Smoking cigarettes... decreases the number of eggs you have in the vault ... You have a higher chance of going into menopause earlier, and it increases the risk of having abnormal chromosomes.

The age of which you start the onset of your period does not impact how long you're going to have a reproductive lifespan.

There's definitely companies now which are promoting and talking about traditional diapers that they are making sure have less toxins in them. And I always think anytime you can decrease toxin exposure to a child, it's going to be very important.

The longer you're on testosterone, the harder it may be to get sperm production to come back—and in 25% of people, they may not get it back if they've been on prolonged testosterone exposure.

In general, if somebody has extremely regular cycles, then that's a complete lie. You can't get pregnant on your period.

The fertile window is this 5-day period ending on the day of ovulation.

Vaping definitely has chemicals that looks like it's associated with poor success rates in IVF cycles.

The odds of getting pregnant at age 43 are less than 3% per month.

And because you're not ovulating on the pill, your incidence of ovarian cancer drops dramatically. 10 years of pill use has dropped the chance of you getting ovarian cancer by more than 90%.