Just wondering

Ricki • 2 boys ages 8 and 3 trying to concieve a baby girl but we just really want a healthy baby
Back in dec / jan i had either a chemical pregnancy or a blighted ovum i bleed for ten days well on jan 24 i got a blaring positive opk so we had sex for the next few days well what im.wondering is when should i test for pregnancy ( as im not sure when my period is due ) i am usually a every 28 dayer ,?