Hello and I hope I can help you today. First of all, I want to reassure you that it is not possible that you could have conceived if you had unprotected sex before your Implanon was removed. Implanon is nearly 100 percent effective in preventing pregnancy while it is in place, and it takes time for you to ovulate again (at least 7-10 days) after it is removed. So if you only had unprotected sex immediately before and after your implant was removed, it is unlikely you could have conceived so quickly. Pregnancy symptoms vary widely between women, and many of the same symptoms we commonly associate with pregnancy such as nausea, bloating, breast tenderness, headaches and irregular bleeding can also happen from an irregular menstrual cycle as well as pregnancy. Many women have irregular periods after discontinuing a hormonal birth control method. So, I suggest you wait for your period, which should occur around 4 weeks after your Implanon removal, and if you miss your period, a urine pregnancy test will be accurate at this time. I hope I was able to adequately answer your question today and that this information was helpful. Best wishes, Dr. Brown