thank you for your query.
Yes the changes you are experiencing are due to the changeover from POP (Progestrone
only pill) to Combined pill. because as the pop suggests,it contains only both estrogen
and progestrone,hence to body will take time to get adjusted to it.
these will last for a few days to a week.If it continues for more than 10days then i would advise you to consult an OB/GYN to change over to a different form of contraception
wishing you good health