I would second Lullabuy conceptions. The woman who runs it is an absolute darling, very helpful. The tests are 20miu/ml. That is they detect a low amount of HCG and can often give you an accurate result before your period is due. Crystal Clear have the same stats but are hugely more expensive. Lullabuy will sell you 1 test for $2. You can buy packs that also include ovulation predictor strips as well. Have a look. If you would rather buy over the counter Crystal Clear is highly recommended.
May you be granted a BFP very very soon.
Lots of love and baby blessings,
Deb