Pregnancy symptoms and negative test

i am a 21 year old female and me and my bf have been living together almost 3 years I was on the depo shot until last July when I was supposed to go back for my next shot but decided not to I only got 2 shots and before that I was on pills since last July I had one short period only 4 days in October n nothing since we have unprotected sex just about everyday and a week and a half ago I visit my mom and she said my breast have gotten bigger I hadn't noticed to much but they are very tender and my nipples are extremely sensitive n hurt very bad! I've had light cramps and a constant headache I feel really bloated and get nausea sometimes throughout the day so I decided to take a test last week it was negative so idk if it was jus too early or if I'm really not it's so hard to tell because I still don't have periods! Anyone that's has any idea please reply!!