I finished my period last wednesday, it was at the normal time of my cycle, my boyfriend and I are trying to concieve and have had sex numerous times in the last week. I started bleeding yesterday, but it is brown and only a very small hint of red, its been going for a day and a half now and is much the same. I took a pregnancy test as soon as i started spotting and it was negative, im pretty sure it would of been too early to tell if i was pregnant or not though right?

Do you think this bleeding could be implantation bleeding? Or does anyone have any other opinions? I would love some advise, thanks