27 weeks and 4 days pregnant

Today has been rough. Started off very hot (90+ degrees today with humidity thanks midwest), then I got nauseous, and I am very tired today, and tonight at work I started getting sharp period-like cramps that happened about 3 times. Instead of googling, I just called Labor and Delivery and the OB on duty was very polite and kind. She basically said if I noticed a pattern to come in and get checked out because I am very early. She suggested to continue drinking water, and to lay down. I can't wait to get off work in an hour (11pm). *I don't think cramps were caused to dehydration as I have drank 100oz+ of water and had soup for dinner. I am a first time mom, so I am unsure of everything. Doctor's appointment Friday.