I did have myself checked for any diseases or infections I may have caught yesterday, and am currently waiting on the results. It looks like it's going to be a long couple of weeks waiting to find out about this, too. Thanks for the input!
First of all, did you see the police about this? Because this guy is on the loose and he's most likely doing this to other women, you need to make a police report. I'm so sorry you had to go through that. Precum can contain sperm, and it sounds like you were raped around the time of your ovulation, so there's a chance for pregnancy. Spotting can be caused from an STD, stress, abrasion, infection, tons of things, implantation spotting would occur about 6-12 days past unprotected sex, so it's much too early for it to be implantation. You can test and get an accurate result 14 days past the sex, so the 20th. I would definitely be tested for STD's, as well. Good luck hun!