Clearly two lines, now I'm doubting

Hi everyone! This afternoon, almost 3 weeks after ovulation and still not having my period, I took a pregnancy test and..... Two very clear lines!! So pregnant!!!!!

But now I'm doubting myself and reading things about false-positive tests, etc.. Like it could be caused by soap residue or something.. My test came straight out of the dishwasher (doesn't sound very nice, sorry) but it was dry and clean. I think I'm just overthinking it, so I'll buy more tests tomorrow! But maybe you guys can reassure me and say that those two bright lines just mean I'm pregnant!?

As for symptoms, I've already had tender breasts for a few days and sometimes heartburn. Also feeling very tired, but these are things I'm now relating to it a lot haha

Best, Anouk