4 days ago I had unprotected intercourse and 2 days after I had pink spotting on my underwear. I've been needing to pee heaps and my nipples have gotten puffy and have gotten bigger and look really different. Someone when I pee my uterus hurts. Im freaking out, my breasts look so different. apparently pregnancy symptoms appear after 6 weeks but some people say they had symptoms as early as 3 days. I'm scared can any one help?