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.
1 Your first trimester lasts from the very beginning of your pregnancy until you're 13 weeks plus six days pregnant. 2  Along with the excitement of discovering that you're expecting, you may feel exhausted and queasy. 3  Your second trimester lasts from when you're 14 weeks to 27 weeks plus six days pregnant.