Help! Is it over???? Don't know what to do!

Basically since I took my first hpt I've been confused and unsure of what's going on with my body. I had 3 positives (and 2 faint positives before that) on February 7, period was due January 30. Started light spotting brown the next day. Then a little red the next day but not even close to what a period bleed would be. Then brown off and on until I was confirmed pregnant by blood test from the dr. They said I was 3-4 weeks. I was exactly 2 weeks late when they drew blood so I was under the impression maybe the hcg levels were a little lower than they should be.

Any spotting I had since then was extremely light and only brown in color. Until the morning of February 18 when I woke up to a jarring amount of blood in my panties. It was probably only a teaspoon and it still wasn't as much as I normally bleed on a period but it was bright red. I cleaned up and went to work with a pad on. I only had very light, brown in color spotting until my lunch at 11. I have had zero spotting of any kind since Thursday and it is now Sunday. This morning I took a dollar store hpt that I just grabbed while I was there. I have a box of FRER coming from amazon this week. But it was definitely negative.

I don't know what to think at this point or what to do next. I would have been about 5 weeks along, but I would have expected more blood. Should I still go to the first ob appointment? Or should I just call my regular dr and have them take another blood test?