Please help!

Ever since the birth of my daughter over a year ago, my periods have been all out of wack. The birth control they prescribed me gave me 2-3 periods a month, lasting around 5 days each. I just recently got it switched to a new one to try and help, but it didn’t. My periods are coming DURING the hormone pills and are completely absent during the sugar pills.

My boyfriend and I had sex while I was on my period during the hormone pills, again on my period while on sugar pills, and once again during the sugar pills with no period.

That was about 1.5 weeks ago.

Since then, (I don’t know if these relate) ive had some achy stomach pains, along with occasional cramps and loss of appetite (I still eat plenty)

Opinions, please!