Not to be harsh, but I'd be extremely surprised if you were pregnant...
You didn't truly have intercourse since you weren't penetrated, you're still having monthly periods, you've had countless negative HPTs, you had a negative blood test; It sounds pretty negative to me.
If something is "growing" down there, you need to see your doctor and figure out what it is. You need to be honest with them and explain that the chances of you being pregnant are slim to none and therefore, something is hugely wrong for something to be growing down there and they need to figure it out and fix it. This isn't something you just wait and see what's going on. Something is wrong and it needs to be seen and taken care of. If you have a cyst or something growing in your uterus, you could be damaging your body by not having it taken care of, and in turn make it unable for you have kids in the future.