TTC, just stopped taking BC

My husband and I have been trying to conceive, since my last period (July 15th) so I stopped taking my BC on the 29th of July. However on Thrusday 31st, I noticed some very faint spotting. On Friday, I had the same thing, just light spotting here and there. But on Saturday morning when I checked there was more blood and what looked to be pieces of the uterine lining. So I figured my period came earlier. But this "period" lasted for 3 days and stopped. I had no cramps, no pain, no bloating or anything like I normally have, so it was weird. Since then I have this fuzzy vibration in my lower abdomen that comes and goes and have been feeling more tired and dizzy every now and then thoughout the day. But I'm not sure what the possibilities of my being pregnant could be since I just got off my BC. Was it just withdrawal bleeding? An actual period? Does anyone have any similar epceirnces that they can share, just to help my husband and I understand what's going on with my body?