Surprise pregnancy after infertility

So Sunday morning my husband and I got a VERY unexpected surprise… a positive pregnancy test!

Back story: we tried to conceive naturally for years and never got pregnant. We did 18 months of fertility treatments, including 6 failed IUIs, and ended up getting pregnant through IVF with our only embryo. She’s now 21 months old. I have never gotten a positive test through a natural cycle. Until now. It was not planned at all, but we’re very excited!! Now comes my question moment…

Monday afternoon I had my first hCG blood test and It ended up coming back at 52 which was lower than my first pregnancy so it made me anxious. I went back in yesterday morning for a second hCG draw. It ended up being drawn around 44 hours after my first. I got the results back this afternoon and it was 105. So it definitely doubled which is obviously what we wanted. I just can’t help but still feel anxious because the numbers aren’t very high, at least compared to our IVF pregnancy.

Has anyone else gone through this? I’m really needing some encouragement/affirmation to calm my anxiety I think.