Can implantation bleeding happen after a missed period?

Edilene

So im 2 weeks late, but i bled a little bit this morning. It was pinky red with like very little brownish discharge. Im so confused on my symptoms! I am constipated, constantly thirsty and peeing. I kind of have naeseau. But since i saw a bit of bleeding this morning, im not sure what it means. Can someone please educate me!