It's good that you are using OPKs as even though you say that you are 7 days from ovulating, the fact that you are getting a line as well as the test line on the OPK would suggest that you are close. Last month FF said that I would ovulate on day 18 and I ovulated on day 15/16 (got a positive OPK on both days).
Possibly (I say possibly, as I'm not sure about your bleeding), you are experiencing your fertile CM (egg white consistency) and it has mixed with older blood left over from your AF leading to spotting. A possible theory.
Good luck both of you in getting your BFPS!
