Hi.im 34 Female...10 Long Years Of Marriage But Still No

Hi.im 34 female...10 long years of marriage but still no children... I had noticed since from my wedding that I had a spot in between my breasts on a middle of my chest.somedys its like a spot and then after 2 or 3 days something comes out from that spot. This discharge is in like yellowish colour...like the other spots...3or 4 times I noticed this after 2 years...can you explain please?? What is this I'm worried about my self...