Uhhh still ttc

I dont know where else to vent. I feel so alone and frustrated. Me and my husband have been trying to concieve our 4th child. Our oldest is 11 our second is 5 and our 3rd was a missed miscarriage. We have been trying to conceive for 2 years with no answer after going to one obgyn and one fertility specialist and having 3 early miscarriages. I went to a different obgyn and he found out i had endometriosis and scheduled for a surgery. After surgery he said it was worse then he thought and 1 tube was completely blocked and one partially blocked. After waiting for our recovery time we started trying this past month I just knew after having my tubes cleaned out and the endometriosis cleaned out we would be pregnant. My period is due in 3days i took a test its negative. Not even close to having a line. I feel so defeated and so upset that what else could I possibly do to get pregnant? Is even going to happen? Am I unable to have children now? All these questions and concerns just keep rushing threw my head. I am very lucky to have my 2boys I have and I am not saying that I dont love them or cherish them but I have baby fever like crazy and feel like we have a piece missing in our family.