hi..Thanks for your query.
You have not mentioned your age , however pattern of acne in your face would be a pointer towards the hormonal
cause for acne.Few tests are important in acne of hormonal origin. the common hormonal tests done for this case are Serum Testosterone
,S.insulin,LH,FSH and cortisol
.There should be an abdominal USG done to rule out pelvic pathologies.Most of anti acne medications are unsafe while planning pregnancy
.You can try a few sessions of Glycolic Peels to get desired results.
As for food, none of the foods have been proved to 'cause' acne.however several people say that their acne gets aggravated on having certain kinds of food.So general advice is to avoid too much dairy products.
Hope this helps!Take care.