It is understandable that, if you usually use condoms, spermicide and so on, you clearly weren't expecting to be pregnant and you should not feel guilty.
And don't worry. Although exposure to chemicals isn't ideal for the embryo, there is no medical link to an increased risk of defects to the unborn baby from women using spermicides when their are unknowingly already pregnant.
If you have any concerns, talk to your midwife or GP. He or she can put your mind at rest, as worrying about possible problems like this can affect your pregnancy and your general state of being at a time when you now have to look after yourself and feel positive about the coming months.