Pregnant or not pregnant

Three days ago I started my period. It was very light and had a brownish pink tint, the first night I didn't bleed at all the second day was the heaviest, but not my normal heavy flow. The third day I spotted on and off.. now I'm on my fourth day and no blood at all? I had unprotected sex twice since my last period in September. I took two tests both came out negative.. but I'm still experiencing pregnancy symptoms