had period and day it was finishing had rising hcg

Emily
Was late by 1-5 days (cycle varies) with negative urine pregnancy tests so blood test was done with hcg 2.9iu/l, Later that day came AF that was probably like a regular period but heavy for me as mine are so light normally. 
Out of curiosity I checked hcg again via blood test 4 days later (last day of AF) and came back at 16.6iu/l... so got home and did urine dips with a first response pg test, two pink lines, the one later that afternoon (my equivalent to morning as I have been on night shifts) still positive but more faint, and now 24hours later a lighter positive still. 
Do you ladies think this is/was chemical? Just want to know opinions or if you had a similar experience? What would you do? Thanks in advance. 
Tests in picture are from the first one at the top to most recent at bottom.