I'm confused. Advice appreciated!

I normally dont get a period without the use of Provera. I've been losing weight and we've been trying to conceive. I got a positive opk (first one ever!) On july 26th. On the 4th-6th I had super light bleeding that wasnt even heavy enough for a liner. It was light pink or brown when I wiped. Whenever I have a period it's super super heavy and full of clots. I did have bad cramps as well. Could this have been implantation bleeding?