Miscarriage... Didn't know I was pregnant :( Advice please?

Thought I got AF on time after early spotting last month and faint positives that then turn to negatives. Figures it was a chemical. AF arrived right on time according to Ovia it last 3days and then I started spotting when I wipe. Day 5, I had a gush of blood and passed a good amount of grey tissue and early that morning I suspected something was up due to passing a small spec of grayish pink. I had no cramps or anything when it happen. Went to the hospital and they confirmed but all my pregnancy urine tests are negative and my hormones are already close to back to 0 :( I'm so upset because I didn't know I was even pregnant. I want to keep trying but this happened after our first month trying. I don't know what to do...