I take pregnancy test because im 10 days late and they all come back negative or negative but have…

I take pregnancy test because im 10 days late and they all come back negative or negative but have very faint lines. but the faint lines dont come in the 3-10 minute range. it's a few hours later and I know you're not supposed to do that. I look up things on the Internet but if you're trying to find something, you'll find it. I just get different things I read like evap lines or those are colorless or evap doesn't happen that soon if you leave the cap on and I don't take it back off so idk. but my second lines don't look colorless, they look like purple or blue but very faint. I'm not sure when I conceived but my ovulation date was the 18th so that would but me over three weeks so I should be getting positives???