I'm just few days before my period comes, i have strong pain in my left lower abdomen and lower back. could it be related to pms? ttc

Yes - that could be: The case. Pms sxs can include feeling tearful, irritability, mood swings, anger, depressed mood, change in sex drive ; anxiety. These may be accompanied by swelling of the breasts (or extremities), weight gain, abdominal bloating, cramps, nausea, ^ urinary frequency, overeating, headaches (to include migraines), dizziness, fainting ; palpitations. Sleep may be disturbed with problems w acne.