My period is two months late but pregnancy test is still negative. have been getting strong positive opk for a month. have symptoms should i get an us?

PCOS: An OPK should only be positive for 1-2 days so the kit is incorrect. It means you have naturally high lh levels. Combined with the missed periods means most likely you have a disroder called polycystic ovarian syndrome. The OPK kits will most likely never work for you so you can save some money. But an evaluation by your obgyn is important.