I’m worried they were wrong

A few days ago I had some bad right sided cramping and light bleeding. I was 4 weeks pregnant and a few days. I was worried I was miscarrying so I went into ER. Two days before this I had my hcg level checked and it was at 43. So went into the Er, they did a transvaginal ultrasound and said they couldn’t see anything in my uterus. I figured that was normal because I was only 4 weeks. Then they say they saw a mass near my right Fallopian tube that they assume is baby. They wanted to confirm with the obgyn to make sure but suspected it was an ectopic. So both of them obgyn there that night come down. They’re super sweet and educational and they tell me they’re so sorry but they agree that this is an ectopic pregnancy. They say I’m a good candidate for methotrexate. My hcg level only went up by 10 within 48 hours. So 43 to 53. I’m reading now though that others have had hcg levels like that but they more than tripled after another 48-72 hours. I’m so scared they were wrong. Or maybe I just want them to be wrong so bad but it’s too late now because I already got the methotrexate injection. The whole time I kept sobbing to my bf “what if they’re wrong what if it’s just too early to see” and I feel like I’ll never really know. It makes the most sense to be ectopic because of the symptoms I was having but..... 😭