Actually breast changes can and do happen in the first trimester. Smoothy is wrong that it doesn't start until the second trimester.
But breast changes can also happen with PMS. Changes in your breast are not a way to diagnose pregnancy. There are other things that these changes can be attributed to.
False negatives are very common. False positives aren't. You've gotten 2 positive results. I wouldn't count the first one though, since the test was expired. But the second, if you used the test correctly, and the test wasn't expired, cannot be discounted.
I would wait and see what happens with your period. If you miss it, wait 2 weeks, then test using first morning urine. Make sure to follow the test to the letter. If that test is positive, congrats. If it's negative, wait for your next period and if you miss it, get a blood test done.
In the meantime, start taking prenatal vitamins. If you're not pregnant they won't harm you, but if you are, they can make all the difference in the health of your baby.
Good luck, and let us know how it goes. :)
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