Are you moisturizing after the cleanser? Skin sometimes reacts to being dried out by over-producing oil, and it's already producing extra oil because of your hormonal changes. It's also possible the scrub is causing abrasions in your skin where bacteria can gather and form pimples. Chemical exfoliation (aha and bha are common terms to look for) is generally recommended over physical exfoliation (like St Ives apricot scrub).
Fresh pillow cases every night can help, same with an elimination diet to see if any food is a trigger for acne.