In a healthy pregnancy your HCG levels should double every 48 hours. But when the pregnancy is not progressing the way it should as in the case of chromosomal abnormality your HCG may rise at slower rates or rise at first and then start to decline. Low HCG levels do not cause miscarriage.
The definition of an invoice is a detailed list of products or services showing the money owed for each item. An example of an invoice is a list of an artist's contributions to a magazine for the month. Invoice is defined as to make or send a list of goods or services for which money is owed. An example of to invoice is to send a bill for written pieces submitted for the week.
A sales invoice can be simply defined as the request of payment by the customer for goods sold or services provided the seller. An invoice generally lists the description and the quantity of the item sold or service provided. The document is also a record of the sale for both the seller and the buyer.redit Terms. The terms of an invoice refer to the time period in which the customer should pay what he owes. Some companies opt to offer their customers a discount for paying their invoice in a specified time period. The terms are described in this format: 2/10, Net 30.