I think I'm having a chemical pregnancy

I suffer with endo and was told I'd never conceive on my own. I have to go through ivf. My partner and myself are not wanting children at this moment in time but we would in the future. We aren't ready yet and we want to buy a house first which we are currently saving for. I'm a few days late with my period and i don't know what made me test yesterday but i did. I saw a second line, a faint line but its there. I didn't know what to think. I didn't say anything as i didn't want to worry my partner without a solid line. This morning I've started to feel cramps, still no blood though. I tested again and the lines gone. I think I'm having a chemical pregnancy. I'm scared to tell him incase he freaks out. I didn't expect to feel how I'm feeling but I'm actually really emotional. My partner is amazing but he has made it clear as did I that he isn't ready yet. How do i deal with this? Do i keep it to myself still? I'm still not ready for a baby so why am i so upset? How do I explain that?