Changing birth control pills?

Question

I was recently taking the birth control pills called Loette and i stopped, i then got my period which ended around 5 days later, about 2 days after it ended me and my fiance had unprotected sex, i did go first thing in the morning and get the morning after pill and a new packet of normal pill - they didn't have my usual and suggested i take another brand which i did anyways now i am experiencing slight back pain and very lite abdominal cramps. Could this be side affects of the morning after pill or from changing the pill from my usual brand - i have not had sexual intercourse since then.

Answer 1

All of those are possible

you should never change brands without consulting your doctor