About 3-4 Months Back I Had Unprotected Sex Quite A

About 3-4 months back i had unprotected sex quite a few times. Now, I'm not stupid, I do know all of the risks that can come with having uprotected sex but at the time I was being very stupid. The first thing I noticed during the first month was getting sick anytime i would eat and getting sick at even the thought of food. I then started throwing up almost every day for about 2-3 weeks and then it stopped. My period came but it was a couple weeks late and was very light but lasted about 5 days. I then started getting very worried when i noticed my belly bloating everyday. My breasts became larger, i started getting a weird feeling in my bellybutton so I decided to research it and could only find it as a symptom of pregnancy. Im really scared because my symptoms havent gone away! The only thing is i have continued to have my period.. I had one positive pregnancy test and went to the doctor and they did a blood test that came back negative and she treated me like i was insane for thinking i could be pregnant? Im 16 years old this is really freaking me out. Ive now noticed my left breast has been growing a little more than my right and they hurt really bad some days and that has never happened to me before. I was working out a lot previous to having these symptoms and i was losing lots of weight but my belly looked like it was gaining weight out of no where!! I stopped working out in fear of being pregnant because i lifted a lot of weights and didnt want to damage anything if i was. My belly is still growing but very slowly and i only look really prego after ive eaten something and i never had any issues with anything before all of this. Ive always been a very healthy girl. I feel bubbling in my pelvic area almost every day now and on occasion it feels like popcorn popping or muscle spasms and i know it isnt gas though i have had more gas than usual as well but it just feels different im not sure how to explain it. I noticed my vains are very noticable all over my body seriously they are everywhere on the sides of my belly/ribs, my arms, legs and breasts and my breasts have never had any noticable vains really or stretch marks or anything. I stopped getting sick and now my hunger is increasing like i can actually eat things now and before i even felt prego i had an eating disorder and really couldnt eat most of the time.. Now im constantly hungry thinking about food!! Im scared to go back to the doctor i feel they will treat me like a crazy person. I dont know what to do.. Is it possible to be pregnant and not produce a lot, if any hcg and still have a "period"?? Im so confused and hurting because i have depression issues so i smoke a lot and ill feel really bad if i am. I know this is long and im sorry im just not sure what to do... I have every symptom literally except a positive test and a stopped period. My mom told me she had a period the whole time she was pregnant with me and she assumed she had misscarried until she started really showing at 6-7 months. Please help...