Pregnant ?

Hey ladies I need to know what y’all think... my last regular period was June 5th right on time and 4 days long my usual. July 6th period came lasted only for a day. Took 4 test all negative. August 1st period came only lasted for a day and starting yesterday my boobs have become sore and today they are leaking what I’m assuming is colostrum. Mind you I have a 9 month old but she hasn’t been breast fed since she was 6 weeks and I’ve never leaked before. Before I go buy more pregnancy test and waste money I wanted to know what you ladies think ?