Looks like your hormonal cycle is slightly off rhythm after the contraception. consult your gynecologist for a more suitable pill fr contraception
As for acne, if this is hormonal, the condition will get better once your period cycles are back to normal. constipation could also trigger pinples.
consult a gynecologist , get an opinion from an endocrinologist and meet a dermatologist if the pimples are aesthetically compromising.
Next Steps
meet with your gynecologist and give a detailed history and get your periods regulated.
Health Tips
drink lot of water, avoid picking on the pimple. donot disturb pimples with toomuch cleaning and soaps. use mild soap. dab a cotton dipped in astringent and apply on the pimple to dry up faster.