Symptoms before positive test?

Em

I’m currently 6 days before my next expected period. For a few days now, I’ve been having very sore and heavy feeling breasts. It reminds me of the first time I was pregnant. This morning, I had a little bit of milk leaking from my breast which is not super common for me since I stopped breastfeeding. I’m trying not to get myself too convinced that I am pregnant, but it’s not normal for my breasts to feel so sore during PMS.

I’ve been testing every day since I was 9 days to next period and no positive yet (which is obvious, but I can’t help myself). So is it possible to have pregnancy symptoms before you even get a positive test?