Which hormone is produced during pregnancy and is commonly measured in blood or urine tests to confirm pregnancy, assess its progression, or detect potential issues, particularly in the early stages of gestation?

a. Luteinizing hormone (LH)
b. Human Chorionic Gonadotropin (HCG/BHCG, Beta HCG)
c. Follicle-stimulating hormone (FSH)
d. Thyroid-stimulating hormone (TSH)