Light Spotting

Lu

Hi guys, I have experience light spotting last week Thursday it stopped by Friday & by Saturday afternoon it started again & again stopped by Night time, Its quite pinkish and the last blood is brownish.. Me and my Bf were intimate Saturday Nite and had bleeding again but stopped again.Didnt experience any cramping or clots or backache. Is it something to be concerned about? Im about 5-6week preggies any advice?