Educational information from Her Form — reviewed for accuracy by our health specialists.
Not a substitute for personal medical advice. Optional 1:1 consults with Robyn, our consulting women's-health specialist, are available on request.
Common symptoms
- •PMS, irritability, anxiety
- •Insomnia in the second half of the cycle
- •Spotting before periods
- •Short cycles (<25 days)
- •Early miscarriage
- •Heavy periods
What drives it
- •Anovulatory or weakly ovulatory cycles
- •Perimenopause
- •Stress, under-fuelling
- •PCOS
- •Thyroid issues
Testing approach
Progesterone must be tested in the luteal phase — about 7 days after ovulation, classically day 21 of a 28-day cycle. We adjust timing if your cycle differs.
What to do next
- ✓Time the draw correctly — luteal-phase only
- ✓Address ovulation drivers: thyroid, stress, fuelling, insulin
- ✓Discuss progesterone support with a doctor if indicated
Frequently asked
How do I know when day 21 is?
It's day 21 of a regular 28-day cycle, or about 7 days after ovulation. If your cycle is longer or irregular, we help you time the draw correctly.
Can I supplement progesterone over the counter?
Bioidentical progesterone is prescription-only in most countries — and dose, timing and form matter. We coordinate with prescribers when indicated.
References
- Jean Hailes for Women's Health— Evidence-based women's health information and research
- Endocrine Society — Clinical practice guidelines— Endocrine and hormone disorder management
- NICE — Women's health guidelines— Clinical evidence-based guidance for women's health
References are provided for educational context only. Her Form is not affiliated with these organisations. Always interpret results with a qualified healthcare professional.
Information on this page is educational — wellness framing, not medical diagnosis. Always interpret results with a doctor who knows your history.