My husband and I have been trying to concieve. We've had intercourse for the past two weeks straight ( sometimes twice or more a day ). I've experienced what I believe was implantation bleeding. It happened yesterday evening. It was just a spot in my underwear, but nothing was there when I wiped. I've been having many symptoms of pregnancy. I've been cramping, having a lot of lower back pain, frequent headaches, fatigue, bloating, a low grade temperature that lasts throughout the day ( higher in the morning ), I've been nauseated but havent vomited. Do you think I might be pregnant? How long should i wait to take a test?