Faint positive and then negative

Kayla

We are currently in the TWW from a medicated cycle. We did letrozole, a trigger shot, and timed intercourse.

I am currently 10 days past trigger (dpt.) I tested out my trigger shot and had clear negatives on 7 and 8 dpt. On 9 dpt I got a positive. Today, it’s back to negative. Any experience with this or any insight? I want to keep testing like a mad woman but also am wondering if I should hold off.