Late period but negative test?

Cassie • 26- Married - 2 sons 🥰 - Baby #3 on its way!

Has anyone ever had their period be late and still get negative test. My last period started January 12th and it's March 4th now. I have had no period. I had wiped once and had like that brown ish stuff you get the beginning Feb 19th and figured it was my period put a tampon in and took it out later and it was dry. I havnt had any spotting or anything. About a week ago I had so much pressure on my csection scar it hurt. I've been having such bad heart burn and my boobs keep hurting like tingling hurting. I also have had alot of like watery clear discharge. Way more than normal. I took a test 2 days ago and it was still negative... idk what else could be Happening. My period hasn't been this late in 3 years and me not be pregnant.