I need answers!

I am now 16 days late on my period! I have taken 4 tests and all have been negative. Calling the OBGYN on Tuesday to get an appointment to see what the frig is going on!

Has anyone ever been pregnant and just had really low HCG levels? When we were pregnant with our son I showed positive 1 day late. I'm going crazy not knowing what's going on!

I should also mention we have been trying for baby 2 for 7 years with absolutely 0 luck... so fingers crossed!