It does suck to never know.
A few years back I had an incredibly bad period where I bled really heavy for days. I actually ended up sleeping for about 24 hours straight because I was so drained from it. I hadn't been using protection with the person I was with so there was a good chance I was pregnant. I swear it was a miscarriage, and I still wonder to this day what would have happened if I was in fact pregnant and what if I didn't miscarry it...?
But you and I will never know and there is really no point in dwelling on it, as much as you wish you could find out for sure. I hope you are able to come to terms with this and move on
Your day for motherhood will come.