AF late

I'm supposed to start today and last month I was a day late and I'm normally on time...is there a chance I could be preggo? I had sex 2-3 times during my fertile window...currently trying! I have tender breast, cm, hip and joint pain to the point where I just want to stay sitting down, some nausea, this will be baby #2 and I didn't even know I was preggo with my daughter until I was 2 months along...didn't have any signs and symptoms with her. Any suggestions will help!