Yes, EWCM is fertile mucous, so you can BD. You could have a positive OPK tomorrow, which means you would ovulate within 12-36 (some say up to 48) hours. If you're tracking your temperatures through FF, you can add the EWCM and it will paint a picture of what is normal for you.
That said, you can BD, but some women get EWCM for several days prior to ovulating.
As others have said, EWCM is fertile CM, so it's likely you are fertile now. Apparently sperm can survive for up to 5 days in fertile CM, so it's possible that sex during times of fertile CM could lead to conception, even if ovulation occurs several days aftwards.