Let’s face it, the menstrual cycle is complicated.

Here’s what’s happening to your hormones during each phase.

Day 2:The period continues.

Lauren Streicher, M.D.

The second day of your cycle is generally a heavy one.

And while yourPMS symptomshave (probably) cleared, you might have some cramps that accompany the bleeding.

This may be a day for super tampons that you’ll have to change regularly.

If you find a small clot in your pad, don’t panic.

That’s perfectly normal for this point in your cycle.

Day 3:This is often the final “heavy” day of bleeding.

You’ll probably continue to see red blood.

If so, try an over-the-counter vaginal probiotic to balance things out.

Day 5:If you generally have a five-day period, a panty liner will usually do it.

Day 6:For many, this is the first day you’ll be free from a period.

Others have periods that last up to seven days, though,which is perfectly normal.

Day 7:By now, your period should be completely or almost gone.

This means that your body is gearing up for next month.

Estrogen levels are starting to rise, testosterone is still low, and progesterone is still absent.

Day 8:Those follicles are growing and preparing to release an egg.

As the eggs start to develop, they produce estrogen, so estrogen levels will start to rise.

Testosterone and progesterone levels will stay the same.

Day 9:Over the next few days, one follicle will continue to develop toward reaching maturity.

Day 10:Estrogen production should now be off the charts.

And your endometrium, or the lining of the womb, continues its plans to house a potential pregnancy.

Be sure to choose a fertility-friendly one for best sperm motility, likePre-Seed2.

Other lubes can harm sperm.

You may notice increased libido around this time as testosterone (the main libido hormone!)

This is nature’s way of encouraging sex at peak baby-making time.

Day 14:You’re ovulating!

The egg is released from the follicle.

If you’re not, don’t skip that condom.

Now your estrogen and testosterone levels are starting to drop, while progesterone levels are rising rapidly.

Day 17:The lining of the uterus is getting thick.

If the egg has successfully united with sperm, it will soon make its home there.

If conception hasn’t taken place within 24 hours of ovulation, the egg will die.

Estrogen levels are on the way down, while progesterone levels are sky-high.

Day 18:Now estrogen will start to make its comeback.

Progesterone levels are still up there.

It’s still too soon to take a pregnancy test.

You may feel slightly bloated and moody.

Day 23:PMS is in full swing.

Treat yourself to a bubble bath or a nice bar of chocolate.

Day 24:About a week after ovulation, your progesterone levels will be at a high.

Estrogen will start to drift down.

Day 25:This will probably be your worst PMS day.Expect major bloat.

And don’t be surprised if running out of ketchup brings on unexpected weeping.

Day 26:Don’t, I repeat, don’t get on the scale.

It’s not you; it’s that premenstrual fluid retention.

Day 27:Get excited: PMS symptoms are winding down.

Day 28:This is about the time that your cycle comes to an end.

If you’re not pregnant, your period is on its way.

The uterine lining is at its thickest to get ready to shed.

Tomorrow, the cycle starts again.