TTC symptoms HELP?!

Hi all, new to this thread! TTC and had these symptoms: 
4 days with brown discharge
 
Really sore nipples to touch
 
Thick white/ but watery discharge (had a smear of pink in it but nothing else
Cramps and lower back pain 
All these could be period symptoms but I'm hoping not! My cycle is still not 100% regular - any advice?