help!!!

Gintare

so me and my man had sex on 24th, 25th and 26th december. all the times he finished inside. acvordig to a few apps tham im using i should start fertile today (27th) or tomorrow (28th) december. the ovolution day is expected on 31st december and the other app says that ita due on 2nd january. is there a chance for me to get pregnant ?