Scared to test

So, I am CD40- app is saying I am 4 days late. I have none of my usual pms symptoms but last night had very a sharp pain in my cervix, which has lasted through to today with some cramping. Feels like af is coming. Tmi: have been getting lots of cm - more than usual. Constantly feeling wet down there but alas, no af still. I have no pregnancy tests at home so did an opk earlier today which was a very strong positive. Not sure if it is worth the pain of buying a preg test in case I get a bfn :( I am thinking I may possibly be OV later than I thought hence the positive showing on the opk now?