Am I pregnant

I'm a lesbian and I just had my first child in may of 2016 due to artifical insemination. We tried again for our second in July 2016 with the same method but when we took the tests they all came up negative. So we just assumed it didn't work. I've had regular bleeding the past five months but lately I've been having heart burn and my breast are starting to swell and we'll as my nappies hurting and I'm leaking colostrum. Me and my fiance are going to get a blood test done on the third. Is it possible I'm pregnant. I haven't gotten much bigger and the urine test said negative last week. Help.