Help me should I get worried about Getting pregnant by this

I know it is a common one but me and my girlfriend was messing around and this is the 1st time we did that naked. One thing lrd to other and I just asked her to let me put it in. But when I touched the opening it went​ ​soft. So I stopped but it touched her opening. When I looked at ​my thing I seen a smudge of water on the tip. I am not sure it is my pre-cum or hers. We both are getting paranoid as that's on her fertile window. We have things that are already going south but if she gets pregnant we will be in big trouble.

I know this is rare but her next period is 10 days away and we can't tolerate the pressure. It's already 72 hours past so plan b is not an option.

Help me should I get worried about this.