I had sex months ago and took plan B the next day . I missed my period for two months and took a pregnacy test and it was negative then it finally came the next month but it was very bright i usually have very painful cramps so i didnt think much of it .I haven't had sex ever sense now its been 3 months and going to the 4th that I missed my period and im getting worried and dont know was going on i took a pregnacy test on the second time i missed my period but it was negative. I been having constant headaches recently and i usually get nauses I feel like i need to pee every couple of minutes. I also change my diet but im still gaining weight. Should I be concern and go see a doctor ? Both my perents are fraternal twins So there's history on my grandmother's side plus my mother of a high chance of having also my self which has me on a worried side a bit.