Have you been on any BC with your BF? I’m only asking because when I was on birthcontrol, for a while it made my periods weird and it made me really moody– the tender breasts may be another side effect.
DONT BOTHER WITH THE BLOOD TEST! they are super expensive and i just learned that they are NO MORE ACCURATE THAN URINE TESTS!
Try another urine test now that it’s been awhile since you were supposed to have your period just to make sure but if it’s negative than you are 99% probably not pregnant.
Also, if your period doesn’t show up next month either, you may have a thyroid problem you need to check with your doctor about. But dont’ worry too much, I thought i had a thyroid problem when i skipped my period one time (which is really unusual for me) and it turned out that it was just too much stress that made me miss it.
You can miss your period for so many reasons, dont jump to any conclusions just yet
Good luck
-Kim