Blood test??

Maryenna
So I just ended day cycle 40 and still no AF. 5 tests have said negative. Today my breasts became very sore and sensitive, but that's not a normal sign before my period. Do I maybe need a blood test? Or is that just if you want to find out early? Trying for #2 and I just have no clue what's going on with my body. Any advice is appreciated 💞