Can low hCG levels and brown spotting prevent pregnancy?

Hi doctor,

My wife has brown spotting and mild abdominal pain since a few days. We did beta hCG test three times, and the results were 257 mlU/ml, 437 mlU/ml, and 657 mlU/ml respectively. Once in a while, she feels a sharp pain on the left side lower abdomen. So, we checked for ectopic pregnancy by transvaginal ultrasound. But they did not find any pregnancy in the left fallopian tube or the uterus, except a thick endometrium. The doctor said that the hope for a viable pregnancy is very low and there is still a chance for an ectopic pregnancy. Based on the hCG results, the doctor decided to go for Methotrexate injection. I would like a second opinion on this.

We got married three years ago, and have been trying to conceive for the past two years. My wife had an ectopic pregnancy which ended with right side fallopian tube removal and a laparoscopic surgery was done to remove a block on the left fallopian tube. The tube is open as per HSG test. Currently, my wife takes Thyronorm, Folsafe and Naturogest 200 medicines. She also has mild PCOD and hyperthyroidism.

Hi doctor,

Thanks for your reply. But, what if a fetus be present in the uterus? Can we go ahead with the pregnancy then?