Situations like this is when common sense comes into play, sorry if that sounds rude. if you think you may be pregnant the only way to know for sure is to take a home pregnancy or visit your doctor to get a blood and urine test.
Your period could be getting ready to come on, or you could be pregnant. If your period hasn't arrived by the expected date, definitely take a pregnancy test. If it's negative, wait a few more days and if it still doesn't show up, test again.
Yes better answers in the other forum. And they only way to know is to take a test.
Theres another forum called "am i pregnant" you will get a better response there and the only advice i have is take a prego test. thats the only acurate way to tell.