We appreciate your concern.
Dating and marriage are not usually instant, and even two to three months may give you enough information to plan around. Additionally, there are medical means of manipulating the cycle when necessary
prior to a wedding. So we do not think this concern need delay your beginning to date.
All that being said, whether or not you are currently dating, if you find that you are not getting a period approximately once per month (every 24-35 days), then we suggest that you see a physician for a check up.
Please write back with any further questions.