Hello. I Am very regular with my cycle every 28 to 30 days, never early sometimes late. I had my cycle dec 27-Jan 1. I started again Jan 18-21. On the 16 my husband and I were sexually active and on the 19 I was vomitting I've been nauseous ever since but have not gotten sick. My breast and noticeably bigger but not sore. I've taken 2 pregnancy test both which were negative. I'm cramping today like I'm going to start. Also smells are bothering me that usually wouldn't and I've been unable to smoke because it makes me feel super sick. Could I be experiencing implantation bleeding? How soon is to soon to take a pt? I don't think my doctor will do one until my first misses period which should be February 15 if I'm on schedule