15 weeks loss and I'm showing signs again

Nikki
After 2 1/2 years of ttc and 4 years together, we got pregnant only to loose it at 7 weeks. I'm 15 weeks post and I'm feeling the cramps, hot flashes, and heightened smell. My hcg levels spiked so fast last time that it caused almost immediate symptoms around implantation. I'm expecting to see spotting in the morning. I'm terrified and at a loss. I didn't expect to get pregnant again so soon and I haven't been eating well or taking my vitamins since the lost of my last. No alcohol but I've had excessive caffeine intake... Have I hurt my chances and of keeping this one if I am pregnant?
**Update. I was in deed pregnant. Listen to your body girls. Though my symptoms are not identical, they were close enough that I knew a couple days before I tested positive.