There are no effects on your hair when you are pregnant.
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Yes, you can get your hair cut during pregnancy.
It is perectly safe to wash your hair during any stage of pregnancy.
There are certain types of medication that cause side-effects like hair growth, and vitamins like over-the-counter Biotin for that exact purpose: hair, nail and skin growth and health. Pregnancy pills can be one of those types, depending on the pill. I personally wouldn't suggest taking pregnancy pills just so that your hair will grow (try Biotin first for that!), but if you're currently on pills, don't be surprised if your hair does grow a little faster than usual, or a little longer than it has before.
They combat pregnancy.
No. it is not a proven fact that facial hair is a early sign of pregnancy, however while pregnant your hair (everywhere) will begin to be a more prominint color.
Gideon Koren has written: 'Cancer in pregnancy and lactation' -- subject(s): Fetus, Prenatal Exposure Delayed Effects, Drug effects, Radiation effects, Neoplastic Pregnancy Complications, Pregnancy, Complications, Lactation, Cancer in pregnancy, Effect of drugs on 'Maternal-Fetal Toxicology' 'Children of Neverland' 'Medication Safety in Pregnancy and Breastfeeding' 'Medication Safety in Pregnancy and Breastfeeding (Koren, Medication Safety in Pregnancy and Breastfeeding)'
of course you can
Sure.
No but the pregnancy hormones can.
By taking a pregnancy test. If it's positive, it might be the pregnancy symptoms.
Hair loss due to pregnancy usually occurs after delivery and is called Telogen effluvium and occurs in 40-50% of women.