Trying to conceive with bf

Hey everyone. Im a 28 yr old mother of 3 children. 2 girls 7 yrs, & 6 yrs old & a 2 yr old boy. My bf & i began trying for a baby Jan 2016. (My 4th his 1st) this is cyle # 5 now. I feel so discouraged. We try so hard. My cycles vary from 26 days - 31 days. My periods are 3 days in length. April's was the 4th-6th & we always were intimate quite a bit last month. I got my period May 4th-6th this month. We had sex the 5th, 9th, & 12th, 13th, & 14th. On the 12th, which would make it 8 days after my period started. I notice i was spotting abit. It was light pink with some mucus in it & it only lasted a few hrs. This wk is my ovulation wk according 2 Glow. Im on day 4 of my ovulation. I tried something the night of the 14th which i did when i conceived my 2nd child & 3rd. After being intimate with my bf, i stayed laying on my back with my butt on a pillow & my feet elevated in the air against the wall for 40 mins (an entire tv show that i watched on my phone) well this morning (now 2 days since then) i woke up feeling abit more tired than usual. & when my bf came home 4 break a couple hrs ago he placed his hand on my stomach between my pelvic bone & belly button i felt pressure (not painful tho.) Almost as if there was something there. Now im tired, my back hurts & im nauseous with back pain & very little (mild cramping) nothing painful tho. What do u all think?