Need advice!

Hi Ladies! Since I had my 1 yr old son I've gotten my periods earlier than Glow estimated like clockwork either by a few days or sometimes by a full week. I am now 4 days late. I've had all my normal PMS symptoms like cramping, moodiness, food cravings and even obsessively checking my underwear because I think I've started but just find a bit of white discharge or nothing at all. I took 2 pregnancy tests on the day I was supposed to start my period and they were both very negative. We had sex last night and stopped because I started to bleed a little but then it stopped immediately. Am I pregnant?! When should I call my doc or retest?! Any advice appreciated!