LUMPS AND LATE PERIOD!!

So I'm 9 days late on my period so far... On June 20th I had unprotected sex and I took Plan B within 48 hours. 6 days later I started to bleed, but only lighter. It was still a period. After that I began to notice 2 lumps on my body, one above my belly button and the other one right below my stomach on the right side (my angle) . I really want to tell mom about my lumps but I'm afraid I could be pregnant.. Please help me. I'm super scared right now..