Thanks for the query.
Actually, partial breast feeding might cause absence of periods, but it does not guarantee that you would not ovulate .
Plus, taking cerazette
24 hours AFTER unprotected intercourse
does NOT protect against pregnancy
Cerazette has to be taken regularly daily, and then too for the first month, a backup method of family planning is always advised.
Instead, you could have tried taking the emergency contraceptive pill
Anyways, for the time being, you can use a barrier method ( condom etc ) , and get yourself checked by a gynecologist after 3 weeks for any possible pregnancy.
Just one act of unprotected intercourse , that too while breastfeeding
, puts you at low risk of pregnancy.
Once you have your check up, you can ask her to prescribe proper contraceptive pills for you, after assessing you.