I've never had a normal period my whole life

I've never had a normal period my whole life. Even when I was a teenager. I went to the dr. Around 2010 and was diagnosed with PCOS. The dr told me it would be really hard to conceive. I didn't really mind since I wasn't daring anyone at the time. I began birth control to start helping me with it. I had gone periodless for 2 years by the time I went to the dr. Well in summer of 2012 I met a guy. We fell in love. We got married. :-) we went to the dr to try to see if we could get help to conceive. He said there are a few options. I could do the gastric bypass surgery to help loose weight and almost all the time this surgery will fix the PCOS. Well. In December of 2015 I had the gastric bypass surgery. I've lost 105 pounds. We were told to wait to get pregnant until 18 months after surgery. We were bad and we went off the birth control 9 months after surgery. I had never had a regular period so I wanted to watch it and to clear my system of the birth control. It was amazing. From September to December I had great periods. They came and they left all on their own. We watched when I would be most fertile with Glow. We didn't necessarily do it every day during the peek days. We just maybe did every other day or every 3rd day. Well December 28th came and I was supposed to get my period. I was doubtful because in experience missing a period wasn't anything. So 29th I took a test. Just a generic one. I could barely see the line that said I was pregnant. Next day I took another one. Barely could see a line. I talked to my sister who has had 4 pregnancies. She said I was pregnant. I'm like na.... so 31st of December I took a digital test. Low and behold. I'm going to be a mommy. I can't even believe it.