Sorry in advance for the picture!

This is my first pregnancy and I had my BFP on 4 different tests last week, the clear blue digital placed me at 3-4 weeks along.. However when I wiped yesterday after going to the toilet I noticed very light pink on the toilet roll, this only happened a couple of times but then today when I have wiped after going to the toilet I have noticed some brown discharge appear, this has varied in amounts whenever I have wiped I am worried as I have had very slight cramping however not constant, I still have my other pregnancy symptoms of extremely tender boobs and nausea..

Myself and my husband have been TTC for the past 3 years and was recently about to start <a href="https://glowing.com/glow-fertility-program">fertility treatment</a> before by some miracle we found out that I had managed to conceive naturally so I am a little concerned.. Any advice/knowledge would be amazing!