as march 28th was only 9 days ago i think you may be being a little ahead of yourself thinking you may be able to confirm pregnancy just yet, lol but if its what you want then i will keep my fingers crossed for you x :-)
its a possibility if youve had sex, impossible if you havnt, thats pretty much the most accurate answer youll get on here.
Have you thought about perhaps maybe taking a pregnancy test seeing as your period is late. They are pretty good at giving an accurate answer at such a time.
If you've ALWAYS been regular, then i would say there is a pretty good chance you're pregnant. I got scared when i was only 8 days late and i ended up being pregnant. I guess i'm not an expert tho im only 18 lol. And it also depends... ur situation probably isn't exactly the same as mine was