TMI but guestion

My normal period is usually 10 days and heavy extremely painful but this go around my what I thought was period it was light and pink bright and mucous and lasted 3 days no pain ish got off and had excuse me sex and this came out me how ever no other blood also we are ttc 3rd child with both of my previous kids I bleed my normal period throughout and had them both one 4 months early and the otherb 2 and half months early so I have no clue went to doctor its not yeast and took pregnancy test however like my other children did not show both previous pregnancy didn't show until almost 5 months on hcg screens worried bc I elf like once to be watched carefully fur me to my history of preemies