Is sweet smelling cervical mucus after ovulation an early sign of pregnancy? I've read online people saying this is true. I'm at 7 DPO (cd20 of 28)

No. No, seven days after evenan exactly known ovulation is too early to detect pregnancy in any way, implantation doesnt occur until 6-7 days post-ov."telling early" is this year's blog craze: i'm afraid it's complete nonsense, although its fun to think about.