Could the sex mess up my cycle?

So me and my so has been trying for a baby. Aunt flow came March 6th and ended March 10th. We had sex on the first fertile day which was the 14th (it was actually 12:00am so it was barely my fertile day) but now I’m bloated, light cramping, and extremely gassy.... I feel like I’m about to come on it again!!! What could this be? Ovulation?