Opinions needed, vfl pregnancy test but spotting

Hi everyone, I am CD26 13dpiui and 15dpt. I’ve had faint positives on cheapies the past few mornings and a positive (faint) FRER yesterday afternoon. I had 4 mature follicles before IUI/trigger. I woke up to spotting, which I was a little surprised by. It’s a darker rust color. I’m feeling pretty defeated and like I’m having a chemical and/or period is starting. Obviously a blood test would be best to know what’s going on. Guess I’m just wondering if anyone has had something similar and what was the outcome? My husband asked if since I released 4 eggs if maybe I could be pregnant but the bleeding is the “discarding” of ones that didn’t take? It’s a hopeful thought on his part but I’m not so sure. Advice, opinions welcome. I’m in waiting limbo until tomorrow.