Ectopic pregnancy

I found out I was prego on 1/22. On 2/1 (5 weeks) I started spotting with a little lite bleeding, no cramps and no clots. That lasted 3 days. From then on for 3 weeks I spotted. HCG levels climbed slowly and I ended up having a D&C at 8 weeks 6 days for missed miscarriage. The doctor called Monday and said there was no products of conception in the tissue he removed in surgery. So, he ordered lab work to see if my levels have dropped. They did but only by 85 points. He said this is an ectopic pregnancy and let's wait and see if my body passes it naturally. If I don't is there anyone on here ever had the methetrexate injection? How did it make you feel? Were you able to work? Pain? I'm freaking out! I hope I pass it naturally.