I have been experiencing a few symptoms of pregnancy for the past 2-3 weeks. I am extremely tired all the time, always hungry, I feel like I'm going to throw up however I never do. My nipples are darker than normal. My belly is bloated and I get white creamy discharge. I've asked family members and friends and they all say I might be pregnant. I find that very hard to believe because I have the implant and it's said to be highly effective, when it comes to avoiding pregnancy. I have abnormal periods so I'm not sure whether or not I'm just about to start. I'm really concerned as I am a smoker and need to know for sure if I am pregnant. I took a pregnancy test 3 weeks ago and it came back negative, I am yet to take another.