Sure, if you've have un-protected sex. There are many, many other reasons for this "pinkness" though. Usually this is referred to as spotting. If your lmp (last menstrual period) was Dec. 18th, a home pregnancy test would give you a positive result. A positive pregnancy test can be achieved as early as 14 days after your last period, so if you're concerned, take a test! If you are not pregnant, remember to always use a condom! Not only to protect against pregnancy but also STD's!!