Sickle cell disease occurs from genetic changes that cause abnormalities in hemoglobin molecules: 1  Hemoglobin A (HbA) . 2  HbA is the hemoglobin molecule found in normal red blood cells during childhood and adulthood. 3  People who do not have sickle cell disease generally have this type of hemoglobin in their blood cells.ickle cell disease is an inherited blood disorder in which the body produces abnormally shaped red blood cells. In sickle cell disease, the hemoglobin in red blood cells clumps together. This causes red blood cells to become stiff and C-shaped.
A few new pregnancy symptoms will be noticed with the rise and fall of hormonal levels when you are 2 months pregnant. Your waistline is increasing even though you have not put on any significant weight. There is a change in the texture of the hair and skin during pregnancy.
Find how many weeks pregnant you are on the chart below and scan back to see approximately how many months pregnant you are. (Note that you're not one month pregnant until it's been one month since your LMP.). Actually, the only month that's four weeks (or 28 days) long is February â that is, when it's not a leap year. All the others are either 30 or 31 days. So, on average a month is 30.4 days long â or 4.3 weeks. 1  Click here for a printable version of this chart showing how the weeks, months, and trimesters of pregnancy line up with each other.