Had my period 10 days ago and got a positive test today?

I'm a 25 year old married female with 2 young kids. my oldest is 2 1/2 and my youngest is 13 months. I know what it's like to be pregnant. With both my kids I got BFP 9 days past ovulation. They were faint but I could see the lines. Anyway, my husband had a vasectomy on October 9th. Six weeks after his procedure we had unprotected which so happened to be the day I was ovualting. I was a little worried leading up to my period. I got my period right on time almost 2 weeks ago. It was a normal flow and lasted 5 days like usual. Well about 3 days ago I started getting this heaviness feeling in my lower belly (like braxton hicks contractions) and be feeling really off. So today just to rule out pregnancy I picked up a test while I was out. I took it and there is a faint line, VERY faint but I can see it. Am I pregnant? I just had my period 10 days ago and I chart my cycles and I don't think I've ovulated yet. What's going on?????? I'm flipping out!!!!