confused

Sunny, stuffy days, I've become so fed up with you... unable to breathe, praying for rain. My husband sound asleep after the night shift and I'm wondering whether I should pay my doc a call tomorrow. From time to time my belly hardens on one side (usually the right one) or at the very bottom. It lasts for 10-15 seconds and then it's over. When it hardens there's a bulge appearing on the belly, just as if my son is stretching his body. Naturally, I've already browsed the web in search for any pieces of advice, but the web is, as always, packed with every possible kind of information, from "you must see the doctor immediately" to "everything is OK".... By the way, we're starting the 27th week:)