ADVICE PLEASE

Hello I am new to this I have been ttc for about 6 months and I have tried about 10 different apps until I found this one and I really like it. I have irregular cycles but they have been pretty on the dot sense I started using glow 3months ago, I am not to start until March first and yesterday I started spotting and today I am also spotting and have had a pulling cramp in my lower abdomen. I usually get cramps on either side never in my abdomen area, my boobs are not sore just get a burning feeling every now and again. My fertile window was the 10th through the 16th and had intercourse 12 14 15 16 I need advice please. Again I am new to this