Pregnacare false pregnancy test?

Hi ladies. 
​I've been taking pregnacare conception for about 25 days now. I took some pregnancy tests yesterday and they were negative but today I took a pregnancy test and it was positive. 
​I don't want to get excited yet because I don't know if I'm getting a false positive.  I didn't test with first urine so the line was really giant but I know there was a line there. 
AF isn't due until 12th August and I know it's early to test but I've got a faint positive but I don't know if it's the pregnacare conception tablets. 
​Has anyone taken these tablets before?