Hi thanks for writing here.Acne vulgaris is age related condition which occurs under the influence of androgenic hormones.Due to increased hormone levels there is increased oiliness leading to pore blocks causing infection .As far as disease spectrum is concerned it varies from simple black heads to severe cystic acne. There are always some aggregating factors for acne including pregnancy,in pregnancy there is hormone turnover in body causing oil production leading to acne. As far as treatment concerned it should be taken only if required ,since many acne medicines can cause serious birth defects.Drugs which are strictly avoided are retinoids both oral and topical,oral antibiotics,hormonal drugs.Clindamycin is safe,but more safer option is benzyl peroxide,use it at night,also use mild cleanser like cetaphil cleansing lotion,for washing face,wash two times daily,avoid applying other cosmetics over face ,do not squeeze acne or will lead to scarring.You can start definative treatment after your baby is born.Take care.