Sudden stretch marks

Ashley
Ladies, you would think I would know what I'm doing since I've had 2 babies already, but NOT getting pregnant is new to me. A few weeks ago, my boobs went up over a cup size in a week, my nipples got dark and they were so sore. I now have stretch marks all over but the swelling has gone down. I see some veins I didn't see before. I ended up spotting a week later for about 3 days. Took a test and it was negative on September 17 (last period before that was aug 20-25). I'm scared to take another test and see a bfn. I never get pms symptoms, especially not larger, swollen breasts. Could this be a hormonal imbalance or what? Anyone else ever gone through this?