missed period

👑T

I started metformin about 3 months ago. I have had a normal on time period since then, but I'm 11 days late this month . I also have pcos and my periods are irregular. Could this be PCOS or could I actually have a chance of being pregnant? I don't want my hopes up, but we did have sex two times during ovulation last month, once at the beginning and then again when ovulation was highest. I have been a little nauseas and fatigued. help please!