Opk for 4 days

Martika • 26 yrs,I have 5 bonus kids none of my own..

So I started taking opk test months ago right after every cycle around day 12 I used different brands and I would positive opk on day 13 and 14. I read that first response opk are the best so this cycle I bought those and I started testing day 12 and got positive opk 13 14 15 &16 . I was wondering if it was normal to get positive opk 4 days in a row? Today is day 27 of my cycle so 13 and 14 look old.

Pls let me know this normal..