Scientists have found new evidence to prove that contraceptive pills these days could increase risk of clot formation in women. The results show that pills containing one of the newer types of progestogen hormone (drospirenone desogestrel gestodene and cyproterone) are associated with an increased risk of VTE than pills containing older progestogens (levonorgestrel and norethisterone). (Read: Birth control pills effectiveness side-effects and health risks) The University of Nottingham researchers said that this was 'an important clarifying study' that 'has sufficient power to provide reliable comparative findings for different formulations of combined oral contraceptives.' The researchers led by research fellow Yana