Day 19 of the menstrual cycle
In short: what happens on day 19?
Day 19 of the menstrual cycle marks the start of the 'implantation window', when the lining of the uterus is most receptive to an embryo. Progesterone is high and the lining reaches about 13 mm. If fertilisation has occurred, the embryo begins to settle into the uterine lining around this time.
Day 19 of the menstrual cycle – animated explainer
Day 19: cycle dial, uterus and ovaries, hormone levels (illustrative animation).
What the animation shows
- FSH
- Follicle-stimulating hormone: starts the growth of follicles in the ovary
- LH
- Luteinising hormone: its sudden surge triggers ovulation
- E2
- Oestrogen (oestradiol): thickens the lining of the uterus
- P4
- Progesterone: prepares the uterus for a possible pregnancy
- BBT
- Thermometer and dots below: basal body temperature
- RING
- Coloured ring: the 28-day cycle and its phases; the green arc marks the fertile days
- MM
- The measurement in the uterus shows lining thickness; in the ovary it shows follicle or corpus luteum size
Phase
Luteal phase
Chance of pregnancy
Very low
Uterine lining
13.5 mm
Corpus luteum
24 mm
FSH
20
LH
21
Oestrogen
55
Basal body temperature
36.72°C
What is happening in your body today?
The uterine lining nears its thickest and most nourishing state. The muscles of the uterus relax.
Hormones
Progesterone is high; oestrogen is moderate.
How you might feel
You may feel sleepy, calm or have mild mood swings.
Chance of pregnancy
The chance of pregnancy is very low (the fertile window has closed).
Tips for today
- Regular sleep and daylight support your mood
- Eat foods rich in omega-3
- Choose moderate exercise over very strenuous workouts
When to see a doctor
See your doctor if you have bleeding outside your period or severe abdominal pain.
Menstrual cycle day by day: table
| Day | What happens | Fertile window |
|---|---|---|
| Day 1 | First Day of Your Period | — |
| Day 2 | Heaviest Bleeding Day | — |
| Day 3 | FSH Rises, Follicles Grow | — |
| Day 4 | Bleeding Eases, Oestrogen Rises | — |
| Day 5 | Last Day of Your Period | — |
| Day 6 | Follicular Phase Begins | — |
| Day 7 | Dominant Follicle Is Selected | — |
| Day 8 | Oestrogen Rises, Fertile Window Nears | Low |
| Day 9 | Fertile Window Begins | Moderate |
| Day 10 | Fertile Window, Higher Pregnancy Odds | Moderate |
| Day 11 | 3 Days Before Ovulation | High |
| Day 12 | Oestrogen Nears Its Peak | High |
| Day 13 | LH Surge: Ovulation Is Near | Highest |
| Day 14 | Ovulation Day | Highest |
| Day 15 | Luteal Phase Begins | Moderate |
| Day 16 | Progesterone Rises | Low |
| Day 17 | Luteal Phase and Increased Appetite | — |
| Day 18 | Breast Tenderness May Start | — |
| Day 19 | Implantation Window Opens | — |
| Day 20 | Implantation Bleeding Possible | — |
| Day 21 | Progesterone Peak (Day 21 Test) | — |
| Day 22 | Mid-Luteal Phase | — |
| Day 23 | PMS Symptoms May Start | — |
| Day 24 | Hormones Start to Fall | — |
| Day 25 | Late Luteal Phase and PMS | — |
| Day 26 | Progesterone Drop and Cramps | — |
| Day 27 | 1 Day Before Your Period | — |
| Day 28 | Last Day of Your Cycle | — |
Frequently asked questions
When does implantation happen?
The embryo usually implants in the uterine lining 6–10 days after ovulation – roughly between days 20 and 24 of a 28-day cycle.
Can you get pregnant on day 19 of your cycle?
In a regular 28-day cycle, this day is outside the fertile window.
What is a normal endometrial thickness?
In the luteal phase, the uterine lining is usually between 8 and 14 mm; values vary from person to person.
Gynaecology check-ups and follow-up at SoftCare Clinic
Book an appointment with our specialist doctors for irregular periods, painful periods or pregnancy planning.
The information on this page is general guidance based on a typical 28-day cycle and does not replace a medical examination. It should not be used as a method of contraception.
Medical content editor: Op. Dr. Şükrü Sanus