Need advice and support

My DH and I have been TTC for 4m now. We both have a child from a previous relationship both kids are 4 but we have zero kids together. We are trying to change that. This is our first month using glow. We BD every single day including 2 of the 6 days AF comes to visit. Even when we were not TTC. I have very irregular cycles. They vary from 30-35 days. Some months I will go with no AF and others I will have AF for 4w. My OBGYN says I ovulate normal and everything looks great. This month I charted everything, did everything glow suggested I do. I'm on my day 30 of my cycle I'm 12dpo. I had 2 very big dips 3 days apart around ovulation so I'm not sure exactly what day I ovulated. About 9dpo I had a little rusty pink color when I went to the bathroom it only lasted for an hour or so. My child has been hospitalized for the past 5 days. And i have been an emotional wreck My question are.. 1. Even if you have a child from a previous relationship does that nessecerly mean that you can get Prego? 2. Should I look into another OBGYN just to have a second opinion? 3. Why did my bbt dip 2 times with in 3 days? 4. What dip should be concidered the big O dip? Bc they both dropped to the same temp then spiked the exact same? 5. Is the rusty pink color a sign of implantation or just AF coming once again? 6. Would being emotionally stressed 12dpo have a huge effect on implantation? Advice or support would be greatly appreciated. I feel like I am so alone but I know that women out there are going through similar things.