Hey I am 18... I also have had sore boobs. Not so sore you can't touch them but sore and I use to get sore boobs before my period but for the past 4 period I haven't had no soreness and I got on birth control about 2 months ago because I have one more week to go on my 2nd pack of Birth control but we never use condoms or anything but my boyfriend always pulls out before ******... I also resently started to feel bad sometimes and get headaches... I have took one pregnant test last night and it was negative though so I don't know what to think about all this...

In response to your question; it can be plenty of things. If you have a negative pregnancy test and are still experiencing these symptoms it may be that you may have Hormone Imbalance which is when Estrogen and Progesterone levels are not balanced and it causes effects such as... sore boobs, irregular periods, nausea, acne, low libido, fatigue, increase or decrease in appetite etc.

Since you mentioned that you are on birth control pills.. this may be your problem, I hope I've helped.

Yea maybe. I've also had some sharp pains in my lower back last night... about a year ago I had segury to remove a cysit that ruptured... so about a month ago I had been bleeding for a month and that's when I decided to take birthconrol to help the bleeding but the first week I started taken it my boyfreiend ***** on my V.JJ but not inside me, I have also moved my bra size from a C to a Double D and that scared me also