Advice needed :(

I am 2 days late for my period. My discharge is watery does this indicate pregnancy or is this normal before getting your period? This may sound really paranoid and you’re probably thinking “girl calm down it’s only two days” but I’ve had a miscarriage in the past and I’m very scared of pregnancy now. I am on the pill but it has not worked before. Please can you tell me some of your experiences with late periods so I feel a little more at ease. I’m sure it’s just late because I’m stressed and under a lot of pressure right now but that thought is still at the back of my mind