During my hospital skin consultation, they told me that progesterone causes extra sebum. Always ask your doctor before applying any anti-acne products as some ingredients are unsafe.
It is purely those crazy pregnancy hormones at play! With twins, my hormone levels were double and I looked like a pimply teenager again, but it goes away.
Arey, don't worry about these small pimples, beta. Your body is doing such beautiful work right now, just wash your face with mild soap and stay happy.
Don't spend money on expensive acne creams or facials right now. Save that budget for baby clothes and hospital bills, because these pimples will clear up on their own.