I recently had it placed in my arm on the 1st of December which was the 4 day of my cycle. Since I have a light period I only count off 3 to 4 days, but the doctors say you always have a 5day span. That honestly threw me off. But, when I to get the nexplanon I didn't ask any questions, I personally didn't know when would it be best to start having sex . But I waited 23 days but having sex again and my cycle is suppose to start 2 days after or so . Since my cycles are light could that be the reason why I didn't expect any bleeding or anything type of menstrual problems, such as body aches or bloating ? By the way, I'm also afraid I could be pregnant. It's just a thought