help please 😭

I lost my daughter in Jan 2017 @ 18 weeks. since about August I have wanted a 2nd line on a pregnancy test. I want a baby so bad. But now I maybe have a 2nd line and I'm TERRIFIED it's literally all I can think about and I'm scared to get excited. I don't want my baby to think I replaced her, i don't want to feel I replaced her... I'm terrified if I am pregnant I'll loose this baby too and I honestly couldn't handle that. it's 230am and I'm crying my eyes out. tell me I'm not alone in feeling this way please! here's a pic of possible baby #4