Timed intercourse with follicular monitoring: the lowest-intervention treatment, used well

Timed intercourse with follicular monitoring is the simplest fertility treatment we offer: a series of ultrasound scans to track when your dominant follicle will release, paired with intercourse on the right two or three days. It does not always belong in a couple’s plan. When it does, doing it well matters.

What it actually involves

Beginning around cycle day 9 or 10, you have transvaginal scans every 1 to 3 days to measure the dominant follicle. When it reaches 18 to 22 mm, an LH surge or trigger injection is timed and intercourse is recommended over the next 36 to 48 hours. Some cycles add oral medication (letrozole or clomiphene) if ovulation is irregular.

Where it works

Couples under 35 with regular cycles, normal semen analysis, no anatomical issues, and a relatively short duration of trying (under 18 months). Patients with mild ovulatory dysfunction where letrozole or clomiphene restores predictable ovulation. Couples for whom IUI is logistically or financially out of reach in the short term.

Where it usually does not

Tubal blockage. Significant male factor. Diminished ovarian reserve. Female partner over 38 with extended trying. Endometriosis with documented adhesions. In these cases, timed intercourse cycles tend to consume time without changing the underlying problem.

Realistic expectations

Per-cycle pregnancy rates with timed intercourse and monitoring run roughly 8 to 12 percent in well-selected couples, declining with age and diagnosis. Three monitored cycles cumulative success of perhaps 25 percent in younger couples, less in older ones. The right cap is usually three cycles before reassessing.

Questions worth asking your doctor

• Given our diagnosis and my age, what is the per-cycle success rate of timed intercourse versus IUI versus IVF for us?
• How many cycles of monitored intercourse before we move to IUI or IVF?
• Are we adding letrozole or clomiphene? Why or why not?
• What does waiting these cycles cost us in terms of cumulative live-birth probability?

This essay is educational. Every patient’s situation is different – the right plan is shaped in conversation with a fertility specialist who knows the full picture.