Cm before ovulation

Hey everyone, hoping someone can offer some advice. TTC baby #2 on our 3rd cycle trying after recent MMC. Still working out timeline for fertile cm to help chart. Last few days have had creamy/lotion cm now it’s looking watery today. Can you not have any egg white cm and only watery? I’m currently on cycle day 13 of a 30 day cycle. I’m wondering if I could be possibly ovulating late this cycle. Have been trying eBay cheap opk tests but everyday all I get is the faintest line it doesn’t seem to be getting darker at all leading up to ovulation.