Spotting on due date of periods 2 months

My gf had periods on 29 march then 26 april ( both were periods with good flow) on 24 may she had light red colour spotting for two days she spotted this when she went for urination after that it lasted for 2 days with spotting no periods. The after 2-3 weeks she started feeling pain in back leg pain feeling vomit faint. With white mily discharge sometimes no discharge. Then on 21 june ( her due date cause her cycle is 29 days) she had spotting as before but with red mixed brown colour and lasted for 3 days then next day stopped and then again started. After this she had dark brown spotting for days. And now she is feeling same symptoms as described above. I am worried if she is pregnant. One more thing on 11th of april i just touched her private part with only hand over cloths of two layer and we both never had intercourse before. i had tested urine pregnancy on 20th june with negative result. Please tell why is she suffering from these things.