Your week 1 guide

Week 1 describes the menstrual cycle that came before conception. Nothing is developing yet at this point on the calendar, because the egg that became your baby had not yet been released. This week exists so that the numbering has a fixed starting line, and it is the reason you were already counted as "four weeks pregnant" on the day your test turned positive.

The uterine lining rebuilds itself during this week. After a period, the endometrium thickens again into the soft, blood-rich surface that an embryo can later burrow into. In your pregnancy, this rebuilding already happened and already did its job, which is why implantation was possible at all.

Dating from the last menstrual period gives every clinician the same timeline. Your due date, the window for your dating scan and the timing of every screening test offered to you are all measured from this point. If a later ultrasound measures your baby and suggests a different date, your team may adjust the calendar, and that adjustment is routine rather than a sign of a problem.

Week 1 on the calendar is the week of a period, not a description of today. You are pregnant now, so read this as the backstory of how your weeks are numbered rather than as something you are waiting for. Your actual symptoms belong to the week you are living in, and you can jump ahead to that week whenever you like.

There is no embryo present during week 1, so nothing you did or did not feel then reflects on your pregnancy. Women often look back and worry about a demanding week or a course of medicine taken before they knew. If something specific is troubling you, bring it to your booking appointment, where it can be assessed properly instead of turned over at night.

Cycle length varies widely, so your true conception date may sit earlier or later than the textbook. A 28-day cycle with ovulation on day 14 is an average, not a rule, and plenty of healthy cycles run shorter or longer. This is exactly why a dating scan carries more weight than the calendar, and why a shifted due date is a correction rather than a concern.

Begin or continue the recommended folic acid supplement today rather than at the start of a tidier week. The window in which folic acid does its most important work is the first weeks of pregnancy, so starting now genuinely matters more than starting perfectly. If you have already missed some weeks, that is common and worth mentioning to your midwife, but it is not something to carry as guilt.

Have one conversation with a pharmacist, midwife or doctor about your medicines, supplements and herbal products. Doing this in a single sitting saves you from searching each item separately at midnight and getting contradictory answers. Bring the actual boxes or a photo of them, and do not stop a prescribed medicine on your own first, because for many conditions the risk of stopping is greater than the risk of continuing.

Write down the first day of your last period before the date blurs. Your team will ask for it at your booking appointment, and it is surprisingly easy to lose once the weeks start moving. If you are genuinely unsure, say so rather than guessing, because an uncertain date is a normal reason to offer you an early dating scan. InshaAllah, having the date written down can make that first conversation easier.

Start with folic acid: Now that you are pregnant, begin or continue taking the recommended folic acid supplement as soon as possible. Folic acid supports the earliest development of your baby's brain and spine.

If you were not taking folic acid before discovering your pregnancy, begin now and ask your midwife, doctor or pharmacist which dose is appropriate for you. Some medical histories or medicines mean a higher prescribed dose is needed, but recommendations differ between countries. Do not increase the dose because of body weight alone without individual advice, or change prescribed treatment on your own.