Serious question

brina • Rainbow 🌈 baby girl 🥰…. BABY RILEY 💗 DUE 9/5💕

So me and my bd had sex the day after my cycle which was the day after thanksgiving on the 26 of November and my last cycle was November 20-25 I had took a test December 31st and it was a dark light positive when I want to the obgyn to see how far I was they told me I was 7 wks and 1 day only thing is my cycle is irregular so it doesn’t always come on time or sometimes it would skip some months when I want to the obgyn I talked to one of the nurses and they couldn’t tell me when I conceived because of my cycle being irregular they told me it would be impossible to predict when I conceived because of my cycle not being a constant cycle and one of the nurses told me before she found out she was pregnant the doctors told her that she wasn’t until the 2nd time she want to the doctor the second time she told me she still was getting a cycle even while she was pregnant she didn’t find out she was pregnant till 2 months later this happened to me as well with my first period but at that time my cycle didn’t come on and I want to the hospital and they told me it was a negative I want back and then it was a postive by time I found out how far I was I was 7 wks &5 days and I was in disbelief Aleast 2 months later on I had a cyst on my ovary and the doctors told me I was in high risk so I misscarriage at the time but moral to the story does that mean I conceived in November somewhere because my doctor trying to tell me I conceived in December and I don’t have a regular cycle like most people my cycle is irregular it been like that since I had a cycle and usually when I take a pregnancy test I wait a good month to take one and when I say I took one December 31 it was a visible postive like I already been pregnant and my body regulate different than most girl I took a pregnancy test by the hospital the first time I was pregnant and it was negative so I’m convinced I conceived in November the week before December 1st! What’s y’all honest opinion?