Control lines & test lines on pregnancy tests

Debysue.

Hi gals , would appreciate your advice

Top one is the first test I took on the day my period was due.

2nd is 5 days later. The test line is slightly lighter then the control line so I looked it up today & read that it is normal as it means test line is pulling dye from the control line as HCG levels rise. Should I be worried though as the test line is only slightly darker at this point or am I just worrying ???

Thanks so much

Deby