Could always take a pregnancy test soon.
Hi,
Once sperm or precum dries, it cannot be brought back to life or revived, if it becomes wet or remoistened. You can't get pregnant from dried sperm, hours later. In the future, you may want to keep bacterial wipes and tissue nearby so that you can easily clean up after sexual activity, or make sure to wash your hands afterward... If you notice irregular bleeding before your period is due, you should consider seeing your doctor for advice.
Take Care