Welcome to SK! I'm sorry for your loss. It's never an easy thing, that's for sure.
As for your symptoms, unfortunately it can go either way. Increased progesterone can make your bbs sore. Though the fact that what you are mentioning is your nipples can make a difference. The only time my nipples have been sore has been when I was pregnant.
O can move quite a bit because of a variety of factors. I O almost every CD13, or CD14. But I have O'd as early as CD6 and as late as CD17 so I always test, regardless as to what I know. Because my body may decide to throw me a curve ball.
It sounds like you did O. Unfortunately, if you aren't temping it's going to be impossible to tell unless your doc does an u/s or some bloodwork. We can get EWCM then not O (for whatever reason our body doesn't always give up the egg like it should).
I hope you don't have to wait too long. But don't be too tough on yourself. The fact that you've been able to get pregnant before on the first try makes you extremely lucky. It's not the norm. It does take the average woman younger than 35 about a year to conceive. So be good to yourself. Stress can exacerbate our attempts to conceive.