Trying to conceive

I recently just got off the arm plant I was not on it for the full 3 years, after irregular periods, horrible mood swings & 20 pounds of weight gain I decided to take it off. My husband now wants to try for our little boy because we have two little rgirls but I am not sure when I am ovulating because my period was so irregular.. When I first got my implant I was on my period for a month then it stopped then went two months without it & when it came back it was for 2-3 weeks and then again the cycle would repeat itself for two months I would go without a period and then two - three weeks of having to deal with my period my last period was June 11th and it lasted almost 3 weeks we have had unprotected sex since then and we had sex just this past weekend hoping to get pregnant. How long should I wait to test or how do I know if I'm ovulating? Also is excersizing okay when pregnant like running or jogging ? I don't want to risk going to the gym if it can affect anything