Pregnant or not

Just wanted to share my story, because I'm going crazy with nerves. I have a Jaydess coil, but lately my body keeps telling me 'you're pregnant' - just feeling a bit nauseous and bloated. I actually wanted a baby anyway, so maybe it's just in my head (my boyfriend isn't ready yet). Last night I took an Action test, and there was a faint positive line. Well, I couldn't trust a single test, so I decided to take another one this morning, same brand. This morning: negative. I thought, well, I was negative early in the morning, so it'll probably be negative, but the instructions say that once you've had a positive result, you can trust it. I've been so nervous all morning and night :/ Has anyone else experienced something like this?