For partners
The four phases of the menstrual cycle: a guide for partners
Biology talks about four phases: the period, the follicular phase, ovulation and the luteal phase. We split the last one in two, because the days just before her period often feel very different. Here is what happens in each, and how you can show up for her.
Three rules first
She is the authority. Lunatwin shows averages, not her. If she feels different from what the app says, she is right.
Adjust yourself. Use what you learn to show up for her. Never explain her mood with her cycle.
Be open. Tell her you use Lunatwin. It is care, not surveillance.
Period
Menstrual phase
Warmth, rest and food. You handle the rest.
What’s happening
Estrogen and progesterone are at their lowest. The uterus contracts to shed its lining, and that is what causes cramps.
How she may feel
Often the day with the most pain and the heaviest bleeding. Tired, cold and low on energy. Many also feel relief that the days before their period are over.
What helps
- Ask briefly and concretely if she needs anything: a hot water bottle, painkillers or food.
- Take care of practical things without being asked: groceries, cooking, tidying.
What to avoid
- Don’t comment on her mood or link it to her period.
After her period
Follicular phase
She is getting her energy back. Plan something together.
What’s happening
Estrogen rises steadily. For many, that means more energy, a better mood and a clearer head.
How she may feel
Often one of the easiest stretches. More social, more upbeat and more patient.
What helps
- Plan activities: a workout, a hike, dinner out or friends.
- Have important conversations and make plans now, like vacations or things you need to agree on.
What to avoid
- Don’t coast because everything feels easy. What you do now builds a reserve for the harder days.
Fertile days
Ovulation phase
The peak of the cycle. Be present.
What’s happening
Estrogen is at its peak and LH surges. These are the most fertile days of the cycle.
How she may feel
The high point for energy and desire for many. She may feel especially good in her body.
What helps
- Take the initiative for closeness and romance.
- Do something social and fun together.
What to avoid
- Don’t treat it as a guarantee. For many, stress, sleep and everyday life drive desire more than hormones.
Read more: Ovulation: her high-energy days, explained for partners →
After ovulation
Luteal phase
A slower pace. Swap action for cozy.
What’s happening
Progesterone rises. It has a calming, slightly dampening effect.
How she may feel
Many become calmer and more homebound. Energy dips a little, and desire often eases.
What helps
- Swap action for cozy: cook together, watch a movie or go for a walk.
- Keep in touch steadily, not only when it is fun.
What to avoid
- Don’t read lower desire as a rejection of you.
Before her period
Luteal phase
Be the steady one. Listen more than you fix.
What’s happening
Estrogen and progesterone fall. It is the drop, not the level, that causes PMS in those who are sensitive to it.
How she may feel
She may be more irritable, more easily upset and more sensitive to criticism. Tender breasts, bloating, headaches, poorer sleep and sugar cravings are common. Some barely notice anything.
What helps
- Be the steady one: calm voice, no counterattack.
- Validate without fixing: “That sounds exhausting” instead of solutions.
What to avoid
- Never ask “Is it PMS?”. Her feelings are real whatever the cause, and the question erodes trust.
General information, not medical advice. Every body and every cycle is different, and she is always the authority on how she feels. Lunatwin is not contraception and can’t be used to prevent or plan a pregnancy.