AITAH ..Need advice: I just found out I might be pregnant and I’m scared to quit my new job 😭

I used to work in retail/customer service, but I decided to take a break from work because I wanted to have a second baby. I thought staying home would give me time to focus on my health and hopefully get pregnant.
I actually conceived that same year, but sadly I lost the pregnancy at almost 16 weeks and had to have a D&C. 💔
Earlier this year, I got pregnant again in April, but unfortunately lost that pregnancy at around 8 weeks. It was heartbreaking.
After that, being home and not working was actually making me feel worse because I was constantly thinking about everything I had been through. So I decided to go back to work to keep myself busy and get out of that emotional space. I recently rejoined the same company I used to work for, and they were genuinely so happy to have me back. 😭
Now comes the crazy part… I got a faint positive pregnancy test today. 😭❤️
I’m scheduled to work tomorrow, and honestly, I’m terrified. My job is physically tiring and hectic, and after my previous losses, I really don’t want to take any unnecessary risks this time.
But I literally JUST came back to this company this month, and I feel so guilty even thinking about quitting already. I don’t know how to tell my manager, especially because they were so happy that I returned.
What would you do in my situation? Would you quit right away, wait until the pregnancy is confirmed, or talk to your doctor first about whether the job is actually risky?
And how would you explain to your manager that you need to leave so soon after coming back? 😭
I know a faint line isn’t confirmation yet, so I’m planning to test again, but I’m just overwhelmed and don’t know what the right thing to do is.