Trying to conceive baby #2

My husband has ED and is only 33 . When we decided that we were going to try for baby number 1 it was so easy we only tried 1 time and we got pregnant. 🙏🏼 our daughter is now 13 months old and we have been trying for number 2 since December and nothing. I got my first AF in November since then it hasn't been as regular as it was . Every month I get more and more upset like I don't know what we are doing wrong :( I just bought preseed and I'm hoping that that works. Has anyone else had this problem ? Or tips that might help