Hi, OC pills of 4th generation are best like Yasmin. As it gives almost 99% protection. You can start pill from day 2 of menses but b in first month u need to take double precaution in form of condom. You can take pills safely provided u r not suffering from
Liver disease, Migraine hypertension , or on any Tablets currently, DM and not any other disorders.
Take care and all The best!