Acne after miscarriage

I had a miscarriage in May. Levels back down to 0. My chin has been absolutely awful since then but especially since the beginning of July. One pimple clears up and then 2 more show up to take its place. I take vitamins, drink tons of water, rarely eat fast food or drink pop. I use cetaphil for face wash and mix in a drop of tea tree oil if my skins not too dry. Wash and moisturize day and night. I can't afford to go to a dermatologist. Just wondering if anyone has advice or something similar happen months after miscarriage. Thanks.