I have irregular periods first of all. Me and my boyfriend had intercourse June 1 and 2 weeks later I took a hpt which showed negative. I have kept up with this as if I were pregnant and around week 4 I had bleeding and only bled for 3 days which is not normal for me at all when I have a period. I had wore a 36 c bra until about 3-4 days ago and had to get a 36 d. in a way I feel pregnant but the tests keep giving me a negative result. I am 18 years old and I don't want my parents to know so I haven't made a doctors appointment yet because I don't want my mother to go with me just in case I find out I am.. what should I do and is there a possibility that I could be pregnant?