Should my breast still be tender after taking so many pregnancy test (negative) and being off birthcontrol for a month and a half?

Birth control does a LOT to your body. And getting off it does too. It can take several months before your body is back in normal swing.

I would go to the doctor, and confirm the negative. I have heard of home pregnancy tests giving false negatives due to birth control (being on it or stopping it)

Once you have absolutely ruled out pregnancy, it may be your period. Have you had one since you stopped your birth control?

No I haven't but I've taken at least 10 pregnancy test, so do you believe I could still be pregnant?

If you had sex, you could be pregnant. I can't tell you for sure online if you are or not. Which is why I suggested getting blood work done at your doctors office.

Some women will not show positive till much latter in the home tests, you can confirm with a blood test at doctor.

But just coming off the pill can cause changes to your body

But it's been 2 months since I last had sex and I've been tested. I just want to know is it normal for my breast to still feel a little sore and I'm cramping very badly now... I've had my period twice since I last had sex

With that added information, it is probably unlikely you are pregnant.

It CAN be normal, as I said before, foryour breast t be sore, and for you to cramp, during your period.
Let your doctor know its happening. But other than that, don't be overly concerned. It's a normal side effect of PMS. Sometimes you get it sometimes you don't. Some women get it every time. Some never do.

Here, refresh yourself on the symptoms of PMS.
And good luck

Physical symptoms include:

Breast swelling and tenderness.
Bloating, water retention, weight gain.
Changes in bowel habits.
Acne.
Nipple discharge when nipples or breasts are pressed. (Any leakage that spontaneously happens when you aren't pressing on the nipple should be checked by a health professional.)
Food cravings, especially for sweet or salty foods.
Sleep pattern changes.
Fatigue, lack of energy.
Decreased sexual desire.
Pain. Common complaints include headaches or migraines, breast tenderness, aching muscles and joints, or cramps and low back pain prior to menstrual bleeding.
Behavioral symptoms include:

Aggression.
Withdrawal from family and friends.
Emotional and cognitive symptoms include:

Depression, sadness, hopelessness.
Anger, irritability.
Anxiety.
Mood swings.
Decreased alertness, inability to concentrate.


Premenstrual Syndrome (PMS) Symptoms: Physical and Emotional (http://women.webmd.com/pms/premenstrual-syndrome-pms-symptoms)

Well I'm fine my period came on last night so Im pretty sure that's why I wasfeeling like that