Spotting before period

Ashley • Twenty five. Committed relationship.
Ok I'm really paranoid however I don't know if I should be due to the fact that my period is 15ish days away.
I've been spotting-lightly the first two days and pretty heavily today- after I had pretty bad constipation/cramps the first two days as well.
Like I said I'm 15ish days away from my AF but I'm a little concerned. Can anyone help clear this up for me before I go full blown paranoid about pregnancy or something else that could be serious?