Help!!!

Okay so im on day 37 of my cycle . My period is 6 days late . Ive taken 5 pregnancy tests ! The very first one was a first repsonse gold and it came back positive, the last 4 were just regular first response test and came back negative. is it possible i could be pregnant and got 4 false negatives , or a false positive? 😭 im only 16 , i don't really know what to do. Me and boyfriend are both stressed but calm about it at the same time . Advice anyone ? 😭