Chunky but Funky

So I started my pregnancy at 220 and I'm currently 6+3 and 224 ish. I fluctuate those 4 pounds every few days. I've already grown a bra size, my nausea has been through the roof, and I've been feeling the growing pains in my groin since before 5 weeks. I'm pretty chunky around the middle so I can't tell if I'm getting bigger. All my family, coworkers, and even the lady who helped me but new bras today at the store all think I'm having twins because I'm growing so fast. But obviously I can't really tell. My first ultrasound is at 8 weeks on June 5th so I'll know for sure then. But has anyone been in my shoes? Did you have twins or just one big chunker?

Edit: They meant my boobs growing. My belly is the same.