Did your pregnancy test come back positive? Congratulations! While many women barely feel anything at this point, it does not mean nothing is happening. This part of your pregnancy involves conception and the development of the placenta. By the end of the first month, your baby will be about a quinch long, around the size of rice grain. Find out your due date from our due date calculator here.

Common Pregnancy Symptoms at One Month

The following are the first signs of pregnancy.

  • Missed period
  • Changes in mood
  • Bloating
  • Lower back pains
  • Cramps
  • Urinating frequently
  • Spotting
  • Tender or sore breasts 
  • Nausea
  • Fatigue
  • Constipation
  • Food aversions and cravings 
  • Metal taste in the mouth

Week 1

Conception occurs during the first week of pregnancy, so at this point, you are not ‘pregnant’ yet. In fact, all you have right now is an eager egg, awaiting fertilization. 

Week 2

During ovulation, fertilization may occur when you and your partner have sexual intercourse, or if you undergo In-vitro fertilization (IVF. 

Week 3

The fertilised egg divides into additional cells as it goes down the fallopian tube towards the uterus.  This takes about 3 to 4 days. 

The cells then create a ball that floats in the uterus for 2 to 3 days. Around this time, your body releases a hormone known as Early Pregnancy Factor (EPF) to prevent it from rejecting the embryo.

Week 4

Implantation occurs, defining the beginning of your pregnancy. This is when the ball of cells attaches to the uterus’ lining around 6 days following fertilisation. It completes after 3 to 4 days. 

Concerns in The First Month of Pregnancy

The following are a few of the concerns that a pregnant woman should have during the first month.

  • Ectopic pregnancy – this is when the fertilised egg implants outside of the uterus. The problem is that these cells will rupture the tube once they grow. This can be solved with an urgent surgery. Always keep your prenatal appointments to solve such issues quickly.
  • Miscarriage – there are a number of reasons for a miscarriage during the first trimester, particularly the first month. The most common reason is an issue with the embryo chromosomes. According to medical science, this could be a way for nature to end a pregnancy when the child would not be able to survive. Other reasons include uterus abnormalities and hormonal problems.
  • Teratogens – these are infections or substances like drugs, alcohol, some medications and a few chemicals that can cause birth defects. 

The first month of pregnancy is the most critical for the development of your baby. This is because this is the time when all major structures and organs of your baby form.  Want to track your weight from the word go? Check out our weight tracker for you, here.  

See how your baby will be developing at two months.


Please note that development differs from one child to another. Content intended for educational purposes only, and not a substitute for medical advice from your doctor.

Be careful when using any products mentioned on this website. We hold no regulations for such products or their providers.

Last reviewed March 2019 

Sources: plannedparenthood, pampers, webmd, webmd, aboutkidshealth

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