Possible implantation bleeding?

Moriah

Hey y'all on the 4th my partner and I had sex, then on the 16th I had brown and pinkish discharge thought the day. Yesterday evening before bed I used the bathroom and when I wiped I had a clear mucus membrane. I was wondering when I should test to see if I'm pregnant, I took a dollar one last night (I know first thing is the morning is more accurate but I just couldn't wait!) but it was invalid.