I'm confused, need advice.

Marissa • FTM to beautiful baby girl due August 28 '18

I took a test about a week ago my next period is on the 20th and the test had half a line/half faint. I only noticed it 1 day after. I've taken test since then and all where neg I've even gone back to check and still nothing. what do you all think? ps these are the skinny thin ones in bull off amazon. (pink is ovulation test)