Bare with me .. a lot of details

Monday last week I took a FR 6 day sooner test and got what I thought was a faint positive. I would have been 6-7DPO. Next two days I took same brand test and still thought I was getting faint positives. Fast forward to Thursday (3 days later) I get a very obvious negative, and again on Friday. Same brand test and two additional that were clear blue early detection. All negative. So Friday I scheduled an appointment for blood work. Quantitative HCG, and my results were < 1 so I knew I was out. Saturday morning (5 days later) 10-11 DPO I started having very very light spotting. Not even enough to really need a panty liner (of course I wore one) I saw the spotting about 3 times Saturday. AF was due Sunday so I just assumed that was it and it was just a day early and would be heavier the next day. Next day, still only light spotting, even lighter than the day before. Almost nothing the whole day, mostly only a light pink tint when I would wipe after peeing (sorry TMI). Monday nothing, Tuesday nothing, today nothing. Took another pregnancy test this morning and still negative. I am so confused on what’s happening. I’ve always had extremely regular cycles. Never started more than one day early or one day late.

Always have 5 days of flow, first day light, second and third very heavy, and fourth and fifth light again. It’s never changed. I’m 34, and my period has been the same since I started at 13. So this is throwing me for a major loop.

Has anyone had similar experiences ? What was your outcome ? Anyone have any ideas of what could be going on ?

Also worth noting my husband and I aren’t necessarily trying to conceive. We aren’t preventing it, but being very relaxed about it and welcome it if it happens. So no stress about it until this happened and confused the crap out of me lol.