How did women, especially during times like the Renaissance or the 1700s, discover that they were pregnant? What would, hypothetically, be the earliest time that they could discover that?

by reallytired-tm

mimicofmodes

There's a lot more to be said, as you're asking about a lot of different eras, but I have a previous answer you may be interested in: How did polite Victorian ladies refer (even among themselves) to a late or missed period?