Hello dear,
I understand your concern.
Usually the 
pregnancy symptoms like 
nausea,vomitings,increased urination,sore breasts start 2 weeks after missed period.
So increased frequency of urination and farting might not be attributed to pregnancy.
The first sign of pregnancy is missed period.
So the pregnancy needs to be confirmed by urine pregnancy test.
And the urine pregnancy test gives accurate results a week after missed period.
So wait and check for the period.In case of delay consider doing a urine pregnancy test.
There might be rare chance for pregnancy as the ejaculation was not done.
Very rarely the preejaculate might have sperm so the preejaculate causing pregnancy is rare possibility.
So avoid 
stress and check for the period.
Hope this helps.
Best regards...Dr.Srilatha