Wierd cycle

So I got a 2day period that was way lighter than normal. I'm usually 5days like clockwork always same amount of flow. I've taken several tests all bfn😔. I have to pee a lot and feel a dull pelvic pressure? I've had mild headaches in the morning and been super tired. I am usually hypothyroid. I had my levels checked because I thought it could be that and now I'm hyperthyroid? So weird. Anyways I'm 38and my husband and I have been trying for three years. Another weird thing was I had a super faint line then all the rest have been bfn. Did I maybe have a miscarriage?