Late ovulation?

Hi everyone! I am just looking for advice or feedback. I know we didn't BD alot but I am currently 4 days late, I took a pregnancy test on the 7th with mid-day urine(held for 5 hours) and got a very faint positive. I tested again on the 8th but couldn't really see anything on the test, some could see it and others said it was negative.

During the month of March, my fertile week was the 16th-22nd but then on the 23rd I had extremely healthy cm on the 23rd so it shifted. Could I have ovulated late, causing late period and faint positive? Thanks!