9 weeks post partum c section could I be pregnant again?

Daisy

So on September the 2nd me and my partner took me away for 1 night as a treat for having such a complicated pregnancy  (and dying twice during my complicated emergency c section). We  had sex on that night, unprotected- I know how silly😂 however on the 5th of September I experienced light bleeding  (5 days after) my boobs are also tender. I know it is too early to tell but could I be pregnant and could the bleeding be implantation