Weight loss surgery... Trying to get pregnant

In July of 2014 I had gotten the gastric bypass lost over 115 lbs... I'm trying but yet I'm not trying to have a baby I'm going with the flow.... I'm a little nervous cause I've had sex without protection that week I was ovulating... I don't want to jump to conclusion but I've been very tired and getting hungry then before I don't want to eat too much and make my pouch bigger... I should be getting my period in the next 3 days