Dating a pregnancy without periods
In the meantime, the British Pregnancy Advisory Service (bpas) has stopped charging women living in Northern Ireland for abortion care.
Bpas will also refund any women from Northern Ireland who have had a consultation or treatment since Friday 30 June. If you have an unplanned pregnancy, or are pregnant and not sure what to do, and you live in Northern Ireland, contact our non-directive counselling service on 03.
For most girls, their first menstrual period, or menarche (say: MEH-nar-kee), begins about 2 to 2½ years after breast development starts.
It is essential for the mother to co-operate and give accurate information.
This helps the doctor or midwife to make a right diagnosis and make the most appropriate decision with regards to the health of the mother and the unborn child.
At the beginning of puberty, you'll notice that your breasts are developing and hair will start to grow on your genitals (pubic hair).
A little later, hair also will grow under your arms.
Use our Pregnancy Calculator to calculate these dates for you.