am I testing too early or having a chemical ?

Sam
Hi ladies. I am 2 days late on period everytime I wipe it is clear as day. I'm having pregnancy symptoms as well. I had sex 2 days before the big O using Preseed. Af was due Saturday & I took a cheapie and it was a light positive. Yesterday I took 2 test and they look like they could have been vvvfl but I just counted them as negatives. I called me Gyn & went to the ER & they don't think I'm having a chemical they just believe I am testing too early. So now if I don't bleed they want me to take another test when I'm a week late for AF. What do you ladies think can be going on ? I don't wanna stress about it but I kinda am. Thanks.