Congrats kitten it's good that they are getting darker as well!! The brown discharge as I mentioned before indicates old blood so it is likely that it is from implantation!! I would make an appointment with your doc
Thanks for all the support so far ladies. Today I have had some dark red/brown blood. I'm hoping all is still fine. Bought a digital test for later so will let you know later on. Never thought this would all be so hard, just burst into tears at work about it all.