what could this mean

Yv

ive recently started ttcing for our third. we lost our second 17 hours after he was born. i have been on the mini pill for about 2 years we decided 2018 to be our year for trying. but ive already posted in other sections of glow ( ttc in 30s and one other i cant remember) but the other day i had this in my underwear ive never in my life had it before. please excuse the terrible stained underwear. can you tell me what it could be not sure what is happening with my body as ive not had any blood (red) since coming off the pill on 30th of January. also a couple of weeks ago i sneezed and really wet blob of discharge came out it has never happened before. not sure if its related or not.