Would you say I was 100% not pregnant?

You need to stop the worrying. If no sex, no baby. Unless the lube was used and had sperm in it. But then not likely to have had period on time. And if you are pregnant from lube, it's your brothers baby. So hello Auntie Mom. These twists in the tree get really confusing. Like who are the other set of grandparents? Oh, yeah. They are the same on both sides. Oops. So quit thieving his lube.