3 days late & coughed up this?!

I’m 3 days late and never late. I got a BFN yesterday & have been waking up the past 3 mornings drenched in sweat. I NEVER sweat, I can run a mile and literally have only those little sweat beads on my top lip. I started dripping sweat grocery shopping yesterday 🤦🏻‍♀️ I woke up this morning with junk in my chest and this is what I’ve been coughing up for the last 30 mins 😱 could I have an infection making me late or has anyone else had these symptoms before their BFP?