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.