Idk what to believe

Okay so last month my cycle was supposed to come around the 25th but after it didn't come for a couple days I took a pregnancy test that morning & it came back positive. Then I read somewhere that drinking a lot of water (which I kinda do) could cause a false positive, so I decided to take it at night a few days later, also positive. I just went to my doctors office to have them do a urine test just to be absolutely sure, & it came back negative. I explained what happened & they drew blood & told me I should have the results in a couple days. I'm really concerned because I've never been this late & idk what could've cause it. Anyone have any suggestions?