Everything is awkward now

I'll give you guys a summary. I had been feeling really sick for a week. I had called my grandma just to check in because I usually do. She casually asked me if I've been sexually active, I denied it because I didn't want anyone knowing my business. Mainly because I know how my family is. She asked more questions until I gave in. It was really awkward because my grandpa was in the same room with my grandma while I was having a conversation with her on the phone. Idk how I can look at my grandpa because I feel dirty and that he'd look at me differently. That also goes for how many of my other family members know. Mind you, this was the first time I had sex. They're also far fetching the fact I could be pregnant. I did take the morning after pill but I know nothing is ever 100%. Plus, I shouldn't get sick less than a week after conception. Turns out I went into my local clinic and I only had the stomach flu and possible effects from the pill. I'm stressed out from how my family is acting and confronting my grandpa if I go for a visit. How did your parents and etc react? Sex is a natural thing and I shouldn't feel ashamed, however I am tbh.. Thoughts please?