Need Advice on TTC & no period!

My last period ended on the 26th of August, I haven’t had a period since & all tests are coming back negative. I’m posting a picture to show a test this morning, it’s just a paper one and it sat for atleast 15 mins while I showered. I went to throw it away and saw a pink line under the “max” line so I lifted it up.

Thoughts, concerns, recommendations? 😩 I’ve only been TTC since July but I am always right on track with my period and have never just randomly missed one.