Bless your heart! What a scare! Glad you & dd are OK.
Like others said, your period can return that quickly, even exclusively bf'ing. And you *can* successfully continue bf'ing, just the same. I will warn you that some women (like me) notice a distinct drop in supply just before my period. For me, I always had enough when I nursed ds (no problems there), but pumping enough was sometimes a struggle. That's where a freezer stash came in! I could usually replace my stash after a week or so because my supply (over?)rebounded. At various times, I also used fenugreek and/or mother's milk tea to increase my supply with some success. You can find those at health food stores. Best wishes, & hang in there!