Weeks, Months and Trimesters Guides | ||||||||||
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| How many weeks pregnant am I ? Pregnancy weeks calculator |
How many weeks pregnant am I ?Using the first day of your last menstrual cycle you can figure out when you most likely conceived, how old your baby currently is, and when your baby's birth is expected. If you don't know the length of your cycle, leave that space blank and the average 28 days will be used to calculate your information. | ||

Week By Week Pregnancy Calendar | ||
| First Trimester Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Second Trimester Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20 Week 21 Week 22 Week 23 Week 24 Week 25 Week 26 Third Trimester Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33 Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Week 40 | ||
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| The following Fetal Development information is used as a general guide for healthy pregnancy development, although development may vary due to the mother’s health or a miscalculation of ovulation. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP), and fetal age is the actual age of the growing baby. Most references to pregnancy are usually in gestational age rather than fetal age development, but we have included both so that it is clear what stage development is at. Measurements will be given in total length from crown to rump (CRL) or [head to buttucks] up to week 20 and after week 20 are then given as head to heel. Each pregnancy can differ in weight and length measurements, and these are just a general guideline. Pregnancy is also divided into trimesters which last about 12 - 14 weeks each. Similar to development, these can be calculated from different dates so not all trimester calculations will equal the same. The following information divides the three trimesters into a little over 3 completed months each. The first trimester is week 1 through to the end of week 13. The second trimester usually ends around the 26th week and consists of the 4th, 5th and 6th completed months. The third trimester can end anywhere between the 38th - 42nd week and is the 7th, 8th and 9th completed months of pregnancy. | ||