tailbone pain sore?

OTchic

I started Ripped in 30 3 days ago and the second day i was sore and woke up today the third day with my tailbone area really sore in pain almost if i lay down like for a situp omg pain! so no situps today. I am currently sitting indian style and yeah i feel a lil pain discomfort. is it sore and normal to hurt like this? all i did was 100 situps and Ripped in 30 which is nothing new as I have done it in the past. i don't think its a injury but i am worried.

thanks for any advice!