When to TTC
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Articles & Explainers

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Explainer 6 min read

Does Running Hard Hurt Your Fertility?

My providers told me any exercise was fine while trying to conceive. The research says something more specific — and the problem turns out to be less about how hard you run than about what you eat afterward.

July 2026 Read
Explainer 6 min read

How Ultra-Processed Foods Affect Fertility

A new study asked how ultra-processed food consumption affects fertility and early embryonic development — and the answer was more surprising than expected.

June 2026 Read
5 min read

What's Actually Happening When You Breastfeed A Sick Baby

When my husband came home sick, I started wondering whether breastfeeding would protect our son. A deep dive into the science of antibodies in breastmilk — and what actually happened when illness hit our house.

June 2026 Read
Explainer 14 min read

How Long Will It Take to Get Pregnant? What the Research Actually Shows

A deep dive into the data behind this calculator — how age and contraceptive history affect your timeline, what the studies can and can't tell you, and what to do with this information.

April 2026 Read

When to TTC

Evidence-based fertility planning after birth control, built by a PhD molecular biologist.

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Data Sources

  • Yland JJ et al. (2020). Pregravid contraceptive use and fecundability. BMJ. N=17,954.
  • Wesselink AK et al. (2017). Age and fecundability in a North American preconception cohort. Am J Obstet Gynecol. N=2,962.

© 2026 Colleen Mulvihill, PhD. For informational purposes only. Not medical advice.

Consult a healthcare provider for personalized guidance.