How To Confirm Pregnancy?

can i be pregnant?
hi i am 23 years old and have a 17 month old child so I've been pregnant before. but my issue is that i got my period last month six days early it wasn't light it was however brown a couple days in the middle so i thought maybe Implantation bleeding but i got negative tests. my period is NEVER early. its always on time like clockwork and it has never been affected by stress. Im now a week away from my "new" set period and having pains on the left side by my ovaries...wondering if i could be pregnant...Ive been tired alot lately and frequent urination but other than that no symptoms but i also didn't get any symptoms with my son til i was about six weeks pregnant