Pregnancy is now timed from the first day of your Last Menstrual Period (LMP). The first two weeks of your pregnancy actually include the time of your period, ovulation and fertilization. Actual conception occurs approximately at week 3.
These dates are based on a 28 day cycle and is the general method currently used to determine your Estimated Due Date (EDD). A full term baby is considered 37-42 weeks. If you do not know the date of your LMP, an ultrasound can be used to determine your EDD.
Use our handy due date calculator to determine your EDD.
The chart below shows how the weeks, months and trimesters break down into each other.
*the exact weekly breakdown can differ from source to source. This is just a guideline.
| Trimester | Month | Week |
 first | one | 1-4 |
| two | 5-8 | |
| three | 9-13 | |
 second | four | 14-17 |
| five | 18-21 | |
| six | 22-26 | |
 third | seven | 27-30 |
| eight | 31-35 | |
| nine | 36-40 |
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