Yes, it is certainly possible to lactate early on in your pregnancy; I only done a pregnancy test this time because i had started lactating (i had given up breastfeeding only 5 months earlier), I was 5 weeks pregnant. the sticky stuff you describe sounds like colostrum. if you are concerned at all just talk to your doc or midwife, they should be able to reassure you that although most people don't lactate until the end of pregnancy or after birth, that some people certainly do leak alot earlier then others.