Mixed Feelings

Ok. So my fiancé and I suffered a miscarriage in December and were devastated. We had been trying really hard to conceive again. Using the glow app, we had sex on my most fertile day. I took a pregnancy test yesterday, and it was a very faint positive. I haven't told him because I'm not so sure I'm excited anymore. Lately his behavior has changed, and he is quite annoying. I've been debating whether I even want our relationship. It would suck to have a child caught in the middle. I need advice!!!