Strong positive but negative digital? Wanting advice..

Hey ladies I wasn’t really sure where to post this.. since 10 dpo my second line was increasing. From 10 dpo to 13 dpo I used fmu. At 14 dpo (day af is due) I started getting some brown discharge only when I wiped, and got nervous so I took another test & and got the 14 dpo result in the picture at about 3pm in the afternoon. I put the brown discharge down to the fact my partner and I dtd the night before. I’ve woken up this morning and did a fr digital and it came up negative 👎🏼 basically I’m just scared this could be another chemical & im looking for any advice on what to think or stories of where this has happened to someone else and they’ve gone on to have a healthy pregnancy?..