مناسك حج - مكارم شيرازى، ناصر - الصفحة ٩١ - Acts that are Haraam in the State of Ihram
atonement is one camel, and the obligatory precaution is to finish Umrah and wait for one month, then goes to one of Miqats, wears Ihram again, and retakes Umrah al- Mufradah, and there is no difference between obligatory and Mustahab Umrah. But if it was after Tawaf and Say( and before Taqsir )Umrah is not invalidated.
Article ١٥١- Whenever a Muhrim performs sexual intercourse with his/ her spouse because of forgetfulness, carelessness or ignorance about the matter, then it does not harm his/ her Hajj or Umrah and there is no atonement for that.
Article ١٥٢- If a man performs sexual relation with his wife without intercourse, then he should pay the atonement of one camel, but it is not necessary to retake Hajj in the next year, the ruling is the same for woman and in the case of Ikrah( duress ), this is like past articles.