pelvic pain, lightening crotch and stomach sensations

Diana • TTC #1 successful May 2016, thanks to Glow
It's becoming a pattern now...as the sun sets, the pelvic girdle pain sets in. Now I've been laying here and feeling nonstop lightning crotch and these weird stabbing/pulling sensations in my stomach. No idea what's normal and what's not. 18 weeks. Pregnancy can be so annoying.