Prayers needed

My husband and I lost a baby in August from an ectopic pregnancy. My right tube ruptured and I lost it as well. We have prayed to get pregnant and I am currently 7 weeks 4 days. I've had 3 ultrasounds done and all have shown no sign of pregnancy in my uterus. I haven't had the pains like before until after this last ultrasound. The pain has become constant near my hip bone and it's burns a little. Our doctor has recommended we get the Methotrexate shot to end the pregnancy because he's ruled it ectopic. I want so badly to get a second opinion since my levels are at 5-6 weeks but I'm am so scared that my only tube is going to rupture. I don't know what to do, I feel like I'm on autopilot and have been for a week now. Thinking of losing another baby hurts so bad. All I can do is cry as I type this. Why would God do this to us? What have we done to deserve this not once but twice?