This chapter examines the difficulty of determining time relative to conception in pregnancy. In both the Middle Ages and the contemporary moment, the ways in which time around pregnancy is counted place women at the mercy of external ‘experts’. However, pregnancy and conceiving bodies produce their own internal logic of time relative to the specifics of each individual conception and pregnancy. The Old English prognostics, like many contemporary superstitions, attempt to make legible a pregnant body that is unreadable in many ways, while remedies for infertility balance the authority of the medical practitioner with the agency of the woman seeking treatment.