First response has the strongest positive

Hey guys so I just found out I'm pregnant again after having a miscarriage last month. I'm a little worried because my First Response is the strongest positive a day after my missed period but it's also not getting significantly darker. It looks about the same it did yesterday. All my other test have faint positives. I'm just worried it's gonna end again. If anyone had any experiences. I don't know when i ovulated because we didn't try this month we were taking a break.