7 days late. what do you think?

So according to glow. I am 7 days late. (its usually right on) I completely missed my period for the month of June. I am currently on round 3 of clomid. this is the first time I have ever missed a period and according to what i read this doesn't always mean pregnancy. but these symptoms im having arent normal or typical for me. I'm having lower back pains, on and off what feels like menstrual cramps, headaches, gas, blood after intercourse. So i googled all of these symptoms and they are pregnancy symptoms but I've taken about 8 test since ive missed my period and all have came back negative except 1 cheapie wondfo brand. the faintest line ever showed up. couldnt tell if it was a positive line or just an evap. All my test since then have been negative though. what do you guys think? should I wait it out or call my doctor and schedule a blood test? could I be pregnant but could my hcg be too low to detect. I've read in some cases some woman dont get positives until 6,7,8,9 etc weeks. HELP. I'm driving myself crazy.