BFP at 15 DPO and spotting?!

Sorry, idk what topic to post this under?

I had some faint lines at 13dpo, but assumed they were indents, this is my first BFP. I didn’t read the instructions fully since I was half asleep and didn’t realize the whole tip needed to be in the pee, I only got the very tip - I used a tiny little cup. I’m assuming that’s why it’s so light? I definitely see a pink line. When I went to wipe right after, I had light pink and brown spotting 😭 what is happening. I also had spotting on 12 and 13 DPO that was only enough for one wipe each. I’m currently CD 33 and normally have very regular cycles of 28 days. Is it even worth it to try again with 2nd morning pee in a few hours? Guess I’m calling the doctor as soon as they open!