Mental health, PTSD, and pregnancy

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I witnessed a very traumatic event today, along with my two young children. I have been an absolute wreck since and I’m wondering if anyone knows anything about PTSD? Does it happen right away, or is it over a long period of time? And what if any are the effects in a pregnancy? I’m 27 weeks.

If I’m not feeling better by tomorrow I’m calling the dr, but I just don’t see how my OB is going to really help with a mental health dilemma? Maybe I will be normal by the morning, and it’s just the initial shock? I don’t know.

I realize that asking a dr is the next step; I’m just sitting and crying and wondered if anyone has any similar experience or knowledge about these things?