What are the side effects of birth control pills?

Dear Doctor, I had my first child about 6 months ago and my husband and I ready to resume sexual relations. However, I have been looking at different birth control methods and I feel that pills would be the best choice for me as the others seem complicated. However, I have heard that they cause blood clots. Is this true? What side effects should I be aware of? Please advise me.
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Dr. Rachna Pande