Blood test was positive, even though urine was negative

My doctor called this morning to let me know my pregnancy test (bloodwork) came back positive! Even though yesterday in the morning and evening I took a urine test that showed negative. She said it's still really early and that it can happen sometimes, but that I'm undoubtedly, beautifully, and happily pregnant! I was at work when I got the call, and totally shocked to hear that after 4 months of trying we have our own official little baby in the making :) my heart is just beaming. I couldn't hold it in, so I called my mom since I won't see her until late February. I'm waiting until tonight to tell my husband because I want it to be in person, and I also want to get him a little surprise like a baby birthday cake! Over the moon right now.