Due to the lockdown, I am unable to go to hospital and doctors are also not available in a nearby clinic. Is it possible to visit you personally? How long can we wait? Will it be too late after lockdown opens?

Since you are ahead of the period and UPT positive its likely that you are conceived. Confirmation can be done by USG of abdomen and pelvis. For that you need to visit the hospital. If possible and nearby get to the hospital and have USG done for the confirmation of pregnancy. Then go according to the suggestion of doctor! You can also repeat the UPT once for further confirmation before going to hospital!