please help me read my bbt chart!

I have felt "pregnant" for over a month, thinking I conceived around the middle of January (my symptoms have been crazy!). Last Thursday, 4 days ago, I finally got a positive hpt, but it was very faint. My doctor conducted a blood test the next day followed by one today, and my levels on both tests were <1. I'm wondering, if based on my bbt chart, I had a chemical pregnancy last month (because of the horrible symptoms - I was even drooling during the middle of the day!) and then conceived again this month and am just really early. I took two ovulation predictors that were positive this month, but I wonder if the second one showed positive because of my hcg levels. What do you guys think. I just feel so pregnant and have even gained 7 pounds over the past week! My boobs have been hurting, and my nipples are changing color. Of course, this has been going on since January, but I know my body! What do you guys think? Did I implant really early and just happen to test then?