It's too soon for pregnancy symptoms to start if she is going to be pregnant. Implantation first needs to occur before symptoms can start.
Cervical mucous can indicate pregnancy, but discharge while pregnant and not pregnant is more or less the same. You both are being very irresponsible about sex, as pulling out does not offer any form of protection regardless of how soon you might have pulled out. Unless you both want to become parents in the future, it would be a smart choice for her to get on birth control and you to use condoms. Wait for her to get her period, and if she does not have her take a pregnancy test with first morning urine.
Some people do experience or at least believe they experience pregnancy symptoms as early as implantation, but as far as the discharge it could be perfectly normal. I when not preg have lots of discharge throughout my cycles. The only way to really tell is to test if she misses a period. Also it doesn't matter how careful you are with planning. If you arent ready for kids use protection or don't have sex. Women can easily ovulate early or late and charting whatever your using to tell the difference is not all that accurate.