Symptoms may not start for 6 to 12 hours after exposure to the ultraviolet light. Symptoms include: 1  A feeling that something is in the eyes (foreign body sensation). 2  Sensitivity to light (photophobia). 3  Tearing.
It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester. Conception to about the 12th week of pregnancy marks the first trimester. The second trimester is weeks 13 to 27, and the third trimester starts about 28 weeks and lasts until birth.
How long does pregnancy last and how is the pregnancy divided? Pregnancy lasts about 40 weeks and is divided into 3 trimesters,which are about 12-14 weeks long each. The first trimester ends around week 13, the second ends aroundweek 26, â¦ and the third trimester ends anywhere between week 38 and42, depending on when the baby is born.