Unsure of this

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If I have sex only on the day of ovulation, can i still get pregnant? If so, how high/low are my chances? Also, my cycle was 30days this past month n seems to appear to have ovulated on the 16th day. According to Glow, I ovulated 2 days before that. (Which I know from previous months, Glow isn't 100% accurate.) Help please! Thanks n baby dust to u all!