Late period with severe cramps

Hannah

I just got back from the movies with my family and I had the worst cramps of my life I couldn't even walk all I could do was lay their and cry I missed my period for the month so I am be pregnant I have very light bleeding it's brown but I stuck a tampon in and saw a little red dot could it just be my period coming or is it more likely that I'm pregnant I've had all the symptoms headaches sore breasts and tiredness