Implantation bleeding or period?

Someone help! I don't know if I'm starting my period or having implantation bleeding. I'm freaking out. I want a baby so bad and I'm praying it's not my period. I woke up from a nap today and went to the washroom and when I wiped there was a small amount of brown blood. So I figured I was starting my mentstral cycle. Then my boyfriend and I had sex and when I went per after there was no blood which was unusual for us cause when I have my period and we have sex I always bleed more afterwards. So I put in a tampon and we went for dinner. When I got home I started googling and looking it up online and it told me not to put in a tampon so I went to the bathroom and took it out and it had barely any blood on it and it was a light pink colour. Then about an hour later I went to the washroom just to check for bleeding and there was nothing. I'm so confused. Someone help. I took a pregnancy test on Wednesday night and it was negative. Help! Sorry this is so long!