I need answers

Since March 14 I have been taking OPKs

March 14 I got no LH surge..ever since March 15th all my OPKS have come out positive LH SURGE . Took one this morning around 8;45 am ....I already took a HPT and it was negative. Can anybody help me figure out what’s going on. My fertile window says 11-16... Af is due 3/22