To panic or not to panic...

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Hey ladies, so the day before yesterday I started spotting...it wasn’t enough to saturate a pad but it was brown & very light pink, naturally hubby and I panicked and called OBGYN. We were told to come in, in the morning which we did. The US tech saw a sack, and said I looked like I was right on track with my EDD putting me at 6w2d, she did however say that there was no fetal pole or HB yet but also said that it was completely normal, and no blood I the uterus. Hubby and I were happy and celebrating until we met with our ObGyn 20 mins later. He said that what he was looking at didn’t look good & we will do blood to get a better idea of what we are looking at. He was very matter of fact about it most likely being a miscarriage & that was really hurtful. This is baby #4, I have 11 year old twins and a soon to be 2 year old So I’m aware that due dates can be off... my question is, my cycles are typically between 22 and 30 days. LMP was 06/17/19, I should have ovulated between the 25-2... hubby was gone on work the following week and continued to withdraw until we got our positive July 19th... so there is no way I could have conceived outside of those dates.. I know most of you are not doctors or nurses but what are the chances of this being a viable pregnancy if my pregnancy is underdeveloped with no fetal pole or HB? I have absolutely no pregnancy symptoms whatsoever and I have had HG with both of my other pregnancies.

Sorry to ramble, it’s hard not to stress.