Could I be pregnant?

Hello...This is my first time and I'm a little nervous to see what you guys think. My boyfriend and I have had unprotected sex 4 times in the last two years. I am prone to having Irregular periods from 26 Days to 34 Days, My period has been regular since June at 26- Days. I was supposed to start my cycle on Saturday the 15th. So I thought it would be okay to not use protection the night before. Instead of my period the next morning I think I'm ovulating.. The usual like slippery egg white mucus all day Saturday on through Sunday lasting just 2 days, When I ovulate its usually last 5 days. I don't even remember If ovulated this month and I usually do because It's quite obvious when I ovulate. It is now the Sep 19th and I have not yet started my period. I haven't even had my usual tender breast, cramps and body aches. Ive only been having pinch like cramps.
I appreciate your thoughts

It's possible you ovulated late. The only way to know for sure is to take a pregnancy test. If you ovulated on the 15th and did conceive, then it's too early to show up on a test. If you still haven't had your period by then, take a pregnancy test around the 29th (2 weeks from when you think you ovulated), and you should be able to see a positive if you did conceive.

Thank you.. I'm gonna try my best to not like the idea of possibly being pregnant.. It's happen once about a year ago I thought I was pregnant and I wasn't... My period was exactly 2 weeks late. We aren't trying to conceive but if it happens It would be amazing. I cant wait for the day I become a mother. I can only imagine the feeling of in powering to have your baby inside, giving birth and raising a child.

I agree with Kate. If you did just ovulate on the 15th, I'd wait two weeks from that date and then take a pregnancy test, if your period hasn't showed up by then. Good luck.