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Use of hormonal pills can lead to acne as they affect the secretions and skin texture along with having other effects on you. The irregular periods could be due to various causes. It is difficult to comment on the exact cause without examining you and going ahead with further investigations. If you are worried, you can consider taking second opinion from another gynecologist and proceed with further management as instructed. If you are planning for pregnancy, consider getting complete infertility work-up done for you and your partner to see if there are any underlying causes for the infertility/inability to conceive. Treatment as needed (based on examination and investigations results) would be started to help you get pregnant. Consider visiting your gynecologist/obstetrician for further evaluation and assistance and be in regular follow-up monitoring as instructed.
Take care.