preseed users?

Hi so I was using preseed my first fertile period, my charts a little confusing but my ovulation tests showed my clearest day to be the 17th so from the 15th to the 20th we have used preseed, I never get EWCM always creamy or watery, I have not had sex in a while and this morning while peeing sorry Tmi but a massive glob of EWCM came out as I said I've never had this and it's confused me has anyone ever had this with pressed am I fertile? or is this an effect preseed has?