Ease my mind. PLEASE.

Destiny • Lennon’s mommy.
I just found out the I was pregnant. Estimating 4w5d. My hCG level is 64 (as of yesterday) because i went into the ER for cramping. the cramping feels like i'm getting my period. and i do have lower back pain. i do go back in tomorrow for another hCG test. should i worry?